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The simulation hypothesis proposes that what one experiences as the real world is actually a simulated reality, such as a computer simulation in which humans are constructs.[1][2] There has been much debate over this topic in the philosophical discourse, and regarding practical applications in computing.

In 2003, philosopher Nick Bostrom proposed the simulation argument, which suggests that if a civilization becomes capable of creating conscious simulations, it could generate so many simulated beings that a randomly chosen conscious entity would almost certainly be in a simulation. This argument presents a trilemma:

  1. either such simulations are not created because of technological limitations or self-destruction;
  2. advanced civilizations choose not to create them;
  3. if advanced civilizations do create them, the number of simulations would far exceed base reality and we would therefore almost certainly be living in one.

This assumes that consciousness is not uniquely tied to biological brains but can arise from any system that implements the right computational structures and processes.[3][4]

The hypothesis is preceded by many earlier versions, and variations on the idea have also been featured in science fiction, appearing as a central plot device in many stories and films, such as Simulacron-3 (1964) and The Matrix (1999).[5]

Origins

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Human history is full of thinkers who observed the difference between how things seem and how they might actually be, with dreams, illusions, and hallucinations providing poetic and philosophical metaphors. For example, the "Butterfly Dream" of Zhuangzi from ancient China;[6] or the Indian philosophy of Maya; or in ancient Greek philosophy, where Anaxarchus and Monimus likened existing things to a scene-painting and supposed them to resemble the impressions experienced in sleep or madness.[7] Aztec philosophical texts theorized that the world was a painting or book written by the Teotl.[8] A common theme in the spiritual philosophy of the religious movements collectively referred to by scholars as Gnosticism was the belief that reality as we experience it is the creation of a lesser, possibly malevolent, deity, from which humanity should seek to escape.[9]

In the Western philosophical tradition, Plato's allegory of the cave analogized human beings to chained prisoners unable to see reality. René Descartes' evil demon philosophically formalized these epistemic doubts,[10][11] to be followed by a large literature with subsequent variations like brain in a vat.[12] In 1969, Konrad Zuse published his book Calculating Space on automata theory, in which he proposed the idea that the universe was fundamentally computational, a concept which became known as digital physics.[13] Later, roboticist Hans Moravec explored related themes through the lens of artificial intelligence, discussing concepts like mind uploading and speculating that our current reality might itself be a computer simulation created by future intelligences.[14][15][16]

Simulation argument

[edit]
Nick Bostrom in 2014

Nick Bostrom's premise:

Many works of science fiction as well as some forecasts by serious technologists and futurologists predict that enormous amounts of computing power will be available in the future. Let us suppose for a moment that these predictions are correct. One thing that later generations might do with their super-powerful computers is run detailed simulations of their forebears or of people like their forebears. Because their computers would be so powerful, they could run a great many such simulations. Suppose that these simulated people are conscious (as they would be if the simulations were sufficiently fine-grained and if a certain quite widely accepted position in the philosophy of mind is correct). Then it could be the case that the vast majority of minds like ours do not belong to the original race but rather to people simulated by the advanced descendants of an original race.[17]

Bostrom's conclusion:

It is then possible to argue that, if this were the case, we would be rational to think that we are likely among the simulated minds rather than among the original biological ones.
Therefore, if we don't think that we are currently living in a computer simulation, we are not entitled to believe that we will have descendants who will run lots of such simulations of their forebears.

— Nick Bostrom, Are You Living in a Computer Simulation?, 2003[17]

Expanded argument

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In 2003, Bostrom proposed a trilemma that he called "the simulation argument". Despite its name, the "simulation argument" does not directly argue that humans live in a simulation; instead, it argues that one of three unlikely-seeming propositions is almost certainly true:[3]

  1. "The fraction of human-level civilizations that reach a posthuman stage (that is, one capable of running high-fidelity ancestor simulations) is very close to zero", or
  2. "The fraction of posthuman civilizations that are interested in running simulations of their evolutionary history, or variations thereof, is very close to zero", or
  3. "The fraction of all people with our kind of experiences that are living in a simulation is very close to one".

The trilemma points out that a technologically mature "posthuman" civilization would have enormous computing power. If even a tiny percentage of "ancestor simulations" were run (that is, "high-fidelity" simulations of ancestral life that would be indistinguishable from reality to the simulated ancestor), the total number of simulated ancestors, or "Sims", in the universe (or multiverse, if it exists) would greatly exceed the total number of actual ancestors.[3]

Bostrom uses a type of anthropic reasoning to claim that, if the third proposition is the one of those three that is true, and almost all people live in simulations, then humans are almost certainly living in a simulation.[3]

Bostrom's argument rests on the premise that given sufficiently advanced technology, it would be possible to represent the populated surface of the Earth without recourse to digital physics; that the qualia experienced by a simulated consciousness are comparable or equivalent to those of a naturally occurring human consciousness, and that one or more levels of simulation within simulations would be feasible given only a modest expenditure of computational resources in the real world.[18][3]

Bostrom argues that if one assumes that humans will not be destroyed nor destroy themselves before developing such a technology, and that human descendants will have no overriding legal restrictions or moral compunctions against simulating biospheres or their own historical biosphere, then it would be unreasonable to count ourselves among the small minority of genuine organisms who, sooner or later, will be vastly outnumbered by artificial simulations.[18]

Epistemologically, it is not impossible for humans to tell whether they are living in a simulation. For example, Bostrom suggests that a window could pop up saying: "You are living in a simulation. Click here for more information." However, imperfections in a simulated environment might be difficult for the native inhabitants to identify and for purposes of authenticity, even the simulated memory of a blatant revelation might be purged by a programme. But if any evidence came to light, either for or against the skeptical hypothesis, it would radically alter the aforementioned probability.[18][19]

Bostrom claims that his argument goes beyond the classical ancient "skeptical hypothesis", claiming that "... we have interesting empirical reasons to believe that a certain disjunctive claim about the world is true", the third of the three disjunctive propositions being that humans are almost certainly living in a simulation. Thus, Bostrom, and writers in agreement with Bostrom such as David Chalmers,[20] argue there might be empirical reasons for the "simulation hypothesis", and that therefore the simulation hypothesis is not a skeptical hypothesis but rather a "metaphysical hypothesis". Bostrom says he sees no strong argument for which of the three trilemma propositions is the true one: "If (1) is true, then we will almost certainly go extinct before reaching posthumanity. If (2) is true, then there must be a strong convergence among the courses of advanced civilizations so that virtually none contains any individuals who desire to run ancestor-simulations and are free to do so. If (3) is true, then we almost certainly live in a simulation. In the dark forest of our current ignorance, it seems sensible to apportion one's credence roughly evenly between (1), (2), and (3) ... I note that people who hear about the simulation argument often react by saying, 'Yes, I accept the argument, and it is obvious that it is possibility #n that obtains.' But different people pick a different n. Some think it obvious that (1) is true, others that (2) is true, yet others that (3) is true". As a corollary to the trilemma, Bostrom states that "Unless we are now living in a simulation, our descendants will almost certainly never run an ancestor-simulation."[18]

Criticism of Bostrom's anthropic reasoning

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Further information: Anthropic principle

Bostrom argues that if "the fraction of all people with our kind of experiences that are living in a simulation is very close to one", then it follows that humans probably live in a simulation. Some philosophers disagree, proposing that perhaps "Sims" do not have conscious experiences the same way that unsimulated humans do, or that it can otherwise be self-evident to a human that they are a human rather than a Sim.[21][22] Philosopher Barry Dainton modifies Bostrom's trilemma by substituting "neural ancestor simulations" (ranging from literal brains in a vat, to far-future humans with induced high-fidelity hallucinations that they are their own distant ancestors) for Bostrom's "ancestor simulations", on the grounds that every philosophical school of thought can agree that sufficiently high-tech neural ancestor simulation experiences would be indistinguishable from non-simulated experiences. Even if high-fidelity computer Sims are never conscious, Dainton's reasoning leads to the following conclusion: either the fraction of human-level civilizations that reach a posthuman stage and are able and willing to run large numbers of neural ancestor simulations is close to zero, or some kind of (possibly neural) ancestor simulation exists.[23]

The hypothesis has received criticism from some physicists, such as Sabine Hossenfelder, who considers that it is physically impossible to simulate the universe without producing measurable inconsistencies, and called it pseudoscience and religion.[24] Cosmologist George F. R. Ellis, who stated that "[the hypothesis] is totally impracticable from a technical viewpoint", and that "late-night pub discussion is not a viable theory".[25][26] Some scholars categorically reject—or are uninterested in—anthropic reasoning, dismissing it as "merely philosophical", unfalsifiable, or inherently unscientific.[21]

Some critics propose that the simulation could be in the first generation, and all the simulated people that will one day be created do not yet exist,[21] in accordance with philosophical presentism.

The cosmologist Sean M. Carroll argues that the simulation hypothesis leads to a contradiction: if humans are typical, as it is assumed, and not capable of performing simulations, this contradicts the arguer's assumption that it is easy for us to foresee that other civilizations can most likely perform simulations.[27]

Physicist Frank Wilczek raises an empirical objection, saying that the laws of the universe have hidden complexity which is "not used for anything" and the laws are constrained by time and location – all of this being unnecessary and extraneous in a simulation. He further argues that the simulation argument amounts to "begging the question," due to the "embarrassing question" of the nature of the underlying reality in which this universe is simulated. "Okay if this is a simulated world, what is the thing in which it is simulated made out of? What are the laws for that?"[28]

Brian Eggleston has argued that the future humans of our universe cannot be the ones performing the simulation, since the simulation argument considers our universe to be the one being simulated.[29] In other words, it has been argued that the probability that humans live in a simulated universe is not independent of the prior probability that is assigned to the existence of other universes.

Arguments, within the trilemma, against the simulation hypothesis

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Simulation down to molecular level of very small sample of matter

Some scholars accept the trilemma, and argue that the first or second of the propositions are true, and that the third proposition (the proposition that humans live in a simulation) is false. Physicist Paul Davies uses Bostrom's trilemma as part of one possible argument against a near-infinite multiverse. This argument runs as follows: if there were a near-infinite multiverse, there would be posthuman civilizations running ancestor simulations, which would lead to the untenable and scientifically self-defeating conclusion that humans live in a simulation; therefore, by reductio ad absurdum, existing multiverse theories are likely false. (Unlike Bostrom and Chalmers, Davies (among others) considers the simulation hypothesis to be self-defeating.)[21][30]

Some point out that there is currently no proof of technology that would facilitate the existence of sufficiently high-fidelity ancestor simulation. Additionally, there is no proof that it is physically possible or feasible for a posthuman civilization to create such a simulation, and therefore for the present, the first proposition must be taken to be true.[21] Additionally there are limits of computation.[17][31]

Physicist Marcelo Gleiser objects to the notion that posthumans would have a reason to run simulated universes: "...being so advanced they would have collected enough knowledge about their past to have little interest in this kind of simulation. ...They may have virtual-reality museums, where they could go and experience the lives and tribulations of their ancestors. But a full-fledged, resource-consuming simulation of an entire universe? Sounds like a colossal waste of time". Gleiser also points out that there is no plausible reason to stop at one level of simulation, so that the simulated ancestors might also be simulating their ancestors, and so on, creating an infinite regress akin to the "problem of the First Cause".[32]

In 2019, philosopher Preston Greene suggested that it may be best not to find out if we are living in a simulation, since, if it were found to be true, such knowing might end the simulation.[33]

Economist Robin Hanson argues that a self-interested occupant of a high-fidelity simulation should strive to be entertaining and praiseworthy in order to avoid being turned off or being shunted into a non-conscious low-fidelity part of the simulation. Hanson additionally speculates that someone who is aware that he might be in a simulation might care less about others and live more for today: "your motivation to save for retirement, or to help the poor in Ethiopia, might be muted by realizing that in your simulation, you will never retire and there is no Ethiopia".[34]

Besides attempting to assess whether the simulation hypothesis is true or false, philosophers have also used it to illustrate other philosophical problems, especially in metaphysics and epistemology. David Chalmers has argued that simulated beings might wonder whether their mental lives are governed by the physics of their environment, when in fact these mental lives are simulated separately (and are thus, in fact, not governed by the simulated physics).[35] Chalmers claims that they might eventually find that their thoughts fail to be physically caused, and argues that this means that Cartesian dualism is not necessarily as problematic of a philosophical view as is commonly supposed, though he does not endorse it.[36] Similar arguments have been made for philosophical views about personal identity that say that an individual could have been another human being in the past, as well as views about qualia that say that colors could have appeared differently than they do (the inverted spectrum scenario). In both cases, the claim is that all this would require is hooking up the mental lives to the simulated physics in a different way.[37]

Computationalism

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Main articles: Computationalism and Mathematical universe hypothesis

Computationalism is a philosophy of mind theory stating that cognition is a form of computation. It is relevant to the simulation hypothesis in that it illustrates how a simulation could contain conscious subjects, as required by a "virtual people" simulation. For example, it is well known that physical systems can be simulated to some degree of accuracy. If computationalism is correct and if there is no problem in generating artificial consciousness or cognition, it would establish the theoretical possibility of a simulated reality. Nevertheless, the relationship between cognition and phenomenal qualia of consciousness is disputed. It is possible that consciousness requires a vital substrate that a computer cannot provide and that simulated people, while behaving appropriately, would be philosophical zombies. This would undermine Nick Bostrom's simulation argument; humans cannot be a simulated consciousness, if consciousness, as humans understand it, cannot be simulated. The skeptical hypothesis remains intact, however, and humans could still be vatted brains, existing as conscious beings within a simulated environment, even if consciousness cannot be simulated. It has been suggested that whereas virtual reality would enable a participant to experience only three senses (sight, sound and optionally smell), simulated reality would enable all five (including taste and touch).[citation needed]

Some theorists[38][39] have argued that if the "consciousness-is-computation" version of computationalism and mathematical realism (or radical mathematical Platonism)[40] are true, then consciousness is computation, which in principle is platform independent and thus admits of simulation. This argument states that a "Platonic realm" or ultimate ensemble would contain every algorithm, including those that implement consciousness. Hans Moravec has explored the simulation hypothesis and has argued for a kind of mathematical Platonism according to which every object (including, for example, a stone) can be regarded as implementing every possible computation.[14]

In physics

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In physics, the view of the universe and its workings as the ebb and flow of information was first observed by Wheeler.[41] Consequently, two views of the world emerged: the first one proposes that the universe is a quantum computer,[42] while the other one proposes that the system performing the simulation is distinct from its simulation (the universe).[43] Of the former view, quantum-computing specialist Dave Bacon wrote:

In many respects this point of view may be nothing more than a result of the fact that the notion of computation is the disease of our age—everywhere we look today we see examples of computers, computation, and information theory and thus we extrapolate this to our laws of physics. Indeed, thinking about computing as arising from faulty components, it seems as if the abstraction that uses perfectly operating computers is unlikely to exist as anything but a platonic ideal. Another critique of such a point of view is that there is no evidence for the kind of digitization that characterizes computers nor are there any predictions made by those who advocate such a view that have been experimentally confirmed.[44]

Testing the hypothesis physically

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A method to test one type of simulation hypothesis was proposed in 2012 in a joint paper by physicists Silas R. Beane from the University of Bonn (now at the University of Washington, Seattle), and Zohreh Davoudi and Martin J. Savage from the University of Washington, Seattle.[45] Under the assumption of finite computational resources, the simulation of the universe would be performed by dividing the space-time continuum into a discrete set of points, which may result in observable effects. In analogy with the mini-simulations that lattice-gauge theorists run today to build up nuclei from the underlying theory of strong interactions (known as quantum chromodynamics), several observational consequences of a grid-like space-time have been studied in their work. Among proposed signatures is an anisotropy in the distribution of ultra-high-energy cosmic rays that, if observed, would be consistent with the simulation hypothesis according to these physicists.[46] In 2017, Campbell et al. proposed several experiments aimed at testing the simulation hypothesis in their paper "On Testing the Simulation Theory".[47]

Reception

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Astrophysicist Neil Degrasse Tyson said in a 2018 NBC News interview that he estimated the likelihood of the simulation hypothesis being correct at "better than 50-50 odds", adding "I wish I could summon a strong argument against it, but I can find none".[48] However, in a subsequent interview with Chuck Nice on a YouTube episode of StarTalk, Tyson shared that his friend J. Richard Gott, a professor of astrophysical sciences at Princeton University, made him aware of a strong objection to the simulation hypothesis. The objection claims that the common trait that all hypothetical high-fidelity simulated universes possess is the ability to produce high-fidelity simulated universes. And since our current world does not possess this ability, it would mean that either humans are in the real universe, and therefore simulated universes have not yet been created, or that humans are the last in a very long chain of simulated universes, an observation that makes the simulation hypothesis seem less probable. Regarding this objection, Tyson remarked "that changes my life".[49]

Elon Musk, the CEO of Tesla and SpaceX, stated that the argument for the simulation hypothesis is "quite strong".[50] In a podcast with Joe Rogan, Musk said "If you assume any rate of improvement at all, games will eventually be indistinguishable from reality" before concluding "that it's most likely we're in a simulation".[51] At various other press conferences and events, Musk has also speculated that the likelihood of us living in a simulated reality or computer made by others is about 99.9%, and stated in a 2016 interview that he believed there was "a one in billion chance we're in base reality".[50][52]

Dream argument

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Further information: Dream argument

A dream could be considered a type of simulation capable of fooling someone who is asleep. As a result, Bertrand Russell has argued that the "dream hypothesis" is not a logical impossibility, but that common sense as well as considerations of simplicity and inference to the best explanation rule against it.[53] One of the first philosophers to question the distinction between reality and dreams was Zhuangzi, a Chinese philosopher of the 4th century BC. He phrased the problem as the well-known "Butterfly Dream", which went as follows:

Once Zhuangzi dreamt he was a butterfly, a butterfly flitting and fluttering around, happy with himself and doing as he pleased. He didn't know he was Zhuangzi. Suddenly he woke up and there he was, solid and unmistakable Zhuangzi. But he didn't know if he was Zhuangzi who had dreamt he was a butterfly or a butterfly dreaming he was Zhuangzi. Between Zhuangzi and a butterfly there must be some distinction! This is called the Transformation of Things. (2, tr. Burton Watson 1968:49)

The philosophical underpinnings of this argument are also brought up by Descartes, who was one of the first Western philosophers to do so. In Meditations on First Philosophy, he states "... there are no certain indications by which we may clearly distinguish wakefulness from sleep",[54] and goes on to conclude that "It is possible that I am dreaming right now and that all of my perceptions are false".[54]

Chalmers (2003) discusses the dream hypothesis and notes that this comes in two distinct forms:

  • that he is currently dreaming, in which case many of his beliefs about the world are incorrect;
  • that he has always been dreaming, in which case the objects he perceives actually exist, albeit in his imagination.[55]

Both the dream argument and the simulation hypothesis can be regarded as skeptical hypotheses. Another state of mind in which some argue an individual's perceptions have no physical basis in the real world is psychosis, though psychosis may have a physical basis in the real world and explanations vary.

In On Certainty, the philosopher Ludwig Wittgenstein has argued that such skeptical hypothesis are unsinnig (i.e. non-sensical), as they doubt knowledge that is required in order to make sense of the hypotheses themselves.[56]

The dream hypothesis is also used to develop other philosophical concepts, such as Valberg's personal horizon: what this world would be internal to if this were all a dream.[57]

Lucid dreaming is characterized as an idea where the elements of dreaming and waking are combined to a point where the user knows they are dreaming, or waking perhaps.[58]

[edit]

The simulation hypothesis and related themes like simulated reality have been explored in literature, film and theatre.[59]

Simulacron-3 (1964) by Daniel F. Galouye is an early exploration of a computer-simulated city and inspired screen adaptations including World on a Wire (1973) and, later, The Thirteenth Floor (1999).[60][61]

The Matrix (1999) popularized the idea of humanity unknowingly living inside a machine-generated virtual reality.[62]

In Overdrawn at the Memory Bank (1983/1984), the protagonist undergoes compulsory “doppling” therapy that transfers his consciousness, and—after a mishap—his mind is kept inside the corporation’s central computer.[63]

Theatre has also treated the topic. Jay Scheib’s 2012 play World of Wires was explicitly inspired by Bostrom’s simulation argument and by Fassbinder’s World on a Wire.[64][65]

Philip K. Dick’s short story “We Can Remember It for You Wholesale” (1966) — about implanted memories and unstable realities — formed the basis for Total Recall (1990) and its 2012 remake.[66]

In 2025, Italian creative director and producer Giorgio Fazio released the two-track project Nothing But Simulation, thematically tied to the simulation hypothesis and paired with a generative web experience.[67][68]

See also

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References

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Further reading

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Simulation hypothesis

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from Grokipedia
The simulation hypothesis is a philosophical proposition asserting that what humans experience as reality is likely an advanced computer simulation created by a posthuman civilization capable of running vast numbers of such simulations. Bostrom's argument does not provide details about the nature of this external 'base reality' or the simulators' world, which remains inherently unknowable from within a potential simulation. Formally articulated by Oxford University philosopher Nick Bostrom in his 2003 paper "Are You Living in a Computer Simulation?", the hypothesis challenges conventional understandings of existence by leveraging probabilistic reasoning about technological progress and the potential for simulated realities. Bostrom's core argument is structured as a , stating that at least one of the following must be true: (1) the human species is very likely to go extinct before reaching a "posthuman" stage where it can create advanced simulations; (2) any posthuman civilization is extremely unlikely to run a significant number of simulations of their evolutionary history (or "ancestor simulations"); or (3) we are almost certainly living in a computer . This implies that if advanced civilizations do emerge and simulate their ancestors, the sheer volume of simulated conscious beings would vastly outnumber those in "base reality," making it statistically improbable that we are among the unsimulated few. The hypothesis rests on key assumptions, including substrate-independence—the idea that conscious minds can arise from non-biological substrates like computational systems rather than solely biological brains—and the technological feasibility of posthumans harnessing enormous computational resources, potentially on the scale of planetary-mass computers performing up to 10^42 operations per second. These assumptions draw from trends in computing and neuroscience, suggesting that simulating a human mind or even entire historical epochs could become feasible with sufficient power, estimated at around 10^33 to 10^36 operations for a single human lifetime. Philosophically, the simulation hypothesis intersects with debates in metaphysics, , and the , prompting questions about the nature of , , and ethical obligations toward potential simulators—including why suffering is permitted in a simulated reality and the "problem of simulator evil" concerning the moral responsibility of simulators for allowing suffering. It has also influenced discussions in physics and cosmology, where parallels are drawn to ideas like and , though without empirical testability, it remains speculative. Critics argue that the probabilistic framework overlooks prior probabilities for the existence of base realities versus simulations and may commit errors in applying the principle of indifference to uncertain worlds. Despite these challenges, the hypothesis continues to stimulate interdisciplinary inquiry, underscoring uncertainties in our understanding of and technological futures.

Philosophical Foundations

Historical Precursors

The concept of reality as an illusion or constructed perception has roots in , with one of the earliest examples appearing in the works of the Chinese philosopher Zhuangzi in the 4th century BCE. In his eponymous text, Zhuangzi recounts a dream in which he transforms into a , only to awaken unsure whether he is a man dreaming of being a butterfly or a butterfly dreaming of being a man; this parable challenges the distinction between authentic experience and deceptive simulation, suggesting that what we perceive as may be indistinguishable from a fabricated state. The butterfly dream serves as a proto-simulation idea, emphasizing the fluidity of existence and the potential for perceptual deception without invoking modern technology. In , 's , detailed in Book VII of The Republic around 380 BCE, provides a foundational for illusory realities. describes prisoners chained in a , mistaking shadows projected on a wall by puppeteers for the true world; upon escaping, they discover the shadows' artificial nature and confront the sunlit realm of Forms, representing ultimate truth. This allegory posits that ordinary sensory experience is a mere shadow of a higher, more real existence, akin to a simulated projection that veils deeper ontological layers. Centuries later, René Descartes advanced these skeptical inquiries in his Meditations on First Philosophy (1641), introducing the "evil demon" hypothesis as a radical doubt about external reality. Descartes imagines a powerful deceiver—capable of manipulating all senses and even fabricating mathematical truths—to test the certainty of knowledge; he argues that while the deceiver might counterfeit the world entirely, the act of doubting itself proves the existence of the thinking self ("Cogito, ergo sum"). This hypothesis prefigures simulated realities by positing an external entity that could orchestrate a comprehensive perceptual illusion, indistinguishable from genuine experience unless internal certainty is invoked. In the , George Berkeley's further echoed these themes, asserting in A Treatise Concerning the Principles of Human Knowledge () that consists solely of —"esse est percipere" (to be is to be perceived)—with no independent material substance existing apart from minds and divine . Berkeley contended that objects persist only through continuous perception by finite minds or God, rendering the physical world a dependent construct of sensory ideas rather than an autonomous entity. This view aligns with simulation-like frameworks by prioritizing perceptual construction over objective materiality, influencing later debates on whether requires an underlying "simulator" to maintain coherence. These historical precursors laid conceptual groundwork for questioning the veracity of perceived , ideas that later informed modern formulations of the simulation hypothesis.

Dream Argument and Skepticism

The , a cornerstone of , originates in ancient Indian and Chinese texts, positing that experiences in dreams are so vivid and coherent that they cannot be reliably distinguished from waking perceptions, thereby casting doubt on the certainty of external . In the , dating from approximately 800–200 BCE, dream states (svapna) are described as realms created by the mind from subtle impressions of , where the self (Atman) appears to interact with illusory objects, much like the waking world (jāgrat) is deemed a prolonged dream (dīrgha svapna) lacking independent existence. Similarly, the Chinese philosopher Zhuangzi (c. 369–286 BCE), in his famous "butterfly dream" from the Zhuangzi, recounts dreaming he was a butterfly fluttering freely, only to awaken unsure whether he was Zhuangzi dreaming of a butterfly or a butterfly dreaming it was Zhuangzi, underscoring the fluidity and indistinguishability of identities and states within the Dao. These ancient formulations introduce radical doubt by suggesting no definitive criterion exists to differentiate dream from , implying that what we take as the waking world may be equally illusory. René Descartes formalized the dream argument in his (1641), employing it to systematically undermine the reliability of sensory evidence as a foundation for knowledge. Descartes observes that dream sensations—such as seeing books, hearing voices, or feeling pain—mirror waking ones in clarity and detail, leading him to conclude, "I am deceived whenever I add anything to the pure act of perception," as there are no reliable marks to distinguish the two. This skepticism extends beyond mere perceptual error, challenging the of an external world independent of the mind, and paves the way for his as the only indubitable certainty. The argument echoes earlier skeptical metaphors, such as Plato's , where perceived reality is mere shadows of a truer form. In the 20th century, Norman Malcolm extended and critiqued the dream argument in his book Dreaming (1959), questioning the traditional assumption that dreams involve conscious experiences occurring during sleep. Malcolm argues that reports of dreams are based on post-sleep recall rather than concurrent mental imagery, thereby debating the very criteria used to equate dream vividness with waking reliability and weakening the skeptical force of the argument without fully resolving it. Contemporary philosophers draw direct analogies between the dream argument and the simulation hypothesis, viewing dreams as "internal simulations" generated by the brain's neural processes, which mimic external reality so convincingly that waking life could analogously be a higher-level simulation indistinguishable from a base reality. This parallel amplifies skeptical implications: if dreams foster solipsistic doubt—where only the dreamer's mind is certain—simulated realities could similarly erode confidence in an external world, reviving ancient concerns about the boundaries of knowledge and existence.

The Simulation Argument

Bostrom's Formulation

The simulation hypothesis gained its modern philosophical prominence through the work of Nick Bostrom, a Swedish-born philosopher who was a professor at the University of Oxford and the founding director of the Future of Humanity Institute (2005–2024), where he significantly influenced research on artificial intelligence, existential risks, and the future of humanity. He is currently the founder and principal researcher at the Macrostrategy Research Initiative. In 2003, Bostrom published his seminal paper "Are You Living in a Computer Simulation?" in the Philosophical Quarterly, presenting a probabilistic argument that has become the cornerstone of contemporary discussions on the topic. The paper, first drafted in 2001, explores the implications of advanced computational capabilities for our understanding of reality. At the heart of Bostrom's formulation is the proposition that if any advanced civilization reaches a "posthuman" stage capable of running high-fidelity of their evolutionary history—known as ancestor simulations—then the vast number of such simulated would vastly outnumber the single base from which they originate. In this scenario, conscious beings like humans would be far more likely to exist within one of these than in the original, unsimulated world, suggesting a high probability that our experienced is itself a computer-generated construct. Bostrom posits that posthumans, with access to immense resources, could execute billions or trillions of these , each indistinguishable from base to its inhabitants, thereby rendering the odds overwhelmingly in favor of simulated existence. Bostrom's formulation does not specify or describe the nature of the "base reality" beyond positing that it is inhabited by posthuman civilizations capable of running ancestor simulations. The argument deliberately avoids detailed speculation about the nature of the simulators' reality, as such details are inherently unknowable and inaccessible from within any simulated environment; any purported evidence or access to the outside would itself be part of the simulation. While Bostrom's argument allows for the possibility of nested simulations, speculations about infinite nested layers or fundamentally different physics in the base reality remain purely philosophical and untestable, with no empirical details provided in the original paper. Bostrom's ideas build on earlier 1990s speculations about and computational immortality, particularly Hans Moravec's Mind Children: The Future of Robot and Human Intelligence (1988, expanded in 1999), which envisioned digitized human minds running on supercomputers capable of entire worlds. Similarly, Frank Tipler's The Physics of Immortality (1994) proposed that advanced civilizations could use cosmic-scale computing to past minds, achieving a form of through . These works provided the technological groundwork for Bostrom's , shifting focus from mere possibility to probabilistic likelihood. Upon publication, Bostrom's paper ignited widespread debate in philosophical and technological communities, prompting reconsiderations of , , and the nature of in academic circles and beyond. It drew attention from fields like and cosmology, influencing discussions on and AI ethics, though it also echoed ancient skeptical traditions, such as ' meditations on the unreliability of sensory experience in distinguishing dreams from .

Key Assumptions and Trilemma

Bostrom's simulation argument relies on three foundational assumptions about the future evolution of civilizations and the capabilities of advanced computational systems. The first assumption posits that a significant fraction of civilizations at our current level of development will reach a "" stage, where they possess the technological maturity to run large-scale ancestor simulations—detailed recreations of their evolutionary , including conscious beings like humans. This feasibility is grounded in projections of technological progress, where posthumans could harness immense computational power, such as converting planetary masses into arrays of processors capable of performing on the order of 104210^{42} operations per second, far exceeding the resources needed to simulate an entire human-like . The second assumption addresses the availability of computational resources, asserting that posthuman civilizations would have the capacity to execute a vast number of such simulations using only a minuscule portion of their total power. For instance, simulating the subjective experiences of all humans who have ever lived might require approximately 103310^{33} to 103610^{36} operations, a negligible fraction of posthuman capabilities that could support billions or trillions of parallel simulations without straining resources. The third assumption concerns the nature of , proposing substrate-independence: that conscious states are not tied to biological substrates but can emerge from sufficiently detailed computational processes, such as those replicating the at the level of individual synapses. Under this view, simulated beings would possess genuine indistinguishable from that of base-reality observers. These assumptions lead to Bostrom's , a stating that at least one of the following propositions must be true: (1) the fraction of civilizations that reach the stage is close to zero, due to or stagnation; (2) posthumans have little interest in running ancestor , perhaps due to ethical, resource, or motivational constraints; or (3) we are almost certainly living in a computer . The probabilistic reasoning underpinning the trilemma hinges on the overwhelming disparity in the number of simulated versus original minds. If the first two propositions are false, then the total number of simulated observer-moments (NsimN_{\text{sim}}) would vastly outnumber those in base reality (NorigN_{\text{orig}}), potentially by factors of billions or more, given the scalability of simulations. The fraction of observers who are simulated can thus be approximated as f≈NsimNsim+Norigf \approx \frac{N_{\text{sim}}}{N_{\text{sim}} + N_{\text{orig}}}, approaching 1 under these conditions, implying a high likelihood that any given conscious observer is simulated. This conclusion applies the , specifically a principle of indifference among conscious observers, which dictates that without distinguishing evidence, we should assign probabilities proportional to the size of the reference class of possible observers. From the perspective of an arbitrary conscious being, the probability of inhabiting a is therefore nearly unity if posthumans run numerous such simulations.

Criticisms

Critics of Nick Bostrom's simulation argument have pointed to flaws in its anthropic reasoning, particularly the assumption of equal likelihood across simulated and non-simulated realities, which introduces a selection bias by ignoring prior probabilities of different worlds. Brian Eggleston argues that Bostrom's calculation of the fraction of simulated observers overlooks the prior probability P(W) that other worlds exist, leading to an overestimation of the chance we are simulated; if P(W) is low, the argument fails to establish a high probability of simulation. Jonathan Birch further critiques the argument's selective skepticism, noting that it demands strong evidence for computational limits while dismissing evidence against global skeptical scenarios like simulations, rendering the anthropic selection inconsistent. Arguments against the first prong of Bostrom's trilemma—that nearly all civilizations go extinct before becoming —often invoke the to suggest posthumans are rare or nonexistent, bolstering this prong's likelihood and undermining the simulation probability. The absence of observable implies that advanced civilizations capable of may not emerge, as no evidence of such activity from past humans or aliens has been detected, challenging the assumption of widespread posthuman simulation-running. Critiques of the second prong, positing that posthumans are uninterested in running significant numbers of ancestor simulations, highlight ethical, resource, and motivational constraints. Ethically, posthumans might avoid creating simulations that deceive conscious beings about their reality, viewing such acts as immoral without clear justification for imposing . Resource-wise, simulating detailed ancestor worlds at the neuronal level would demand enormous computational power, potentially equivalent to planet-sized systems, diverting efforts from other pursuits. Moreover, posthumans may lack interest in replicating ancestral histories, preferring to create fictional universes instead, as the motivation for historical accuracy remains unclear. Additional flawed assumptions include the idea that consciousness is substrate-independent and simulable on digital computers, which critics argue is unproven and may not hold if consciousness requires specific biological or physical substrates. Philosophical and epistemological arguments further challenge the hypothesis. Occam's Razor favors base reality as the simplest explanation, requiring no additional layers of simulators, advanced technology, or unproven motivations, while accounting for all observations without introducing unprovable entities. There is also a lack of empirical evidence, such as glitches, artifacts, or inconsistencies indicative of computation; instead, the universe adheres to lawful physics across all scales, with no detectable rendering shortcuts or deviations in high-precision experiments like those detecting gravitational waves. The hypothesis faces epistemological self-defeat: it relies on observations (e.g., technological progress) that, if simulated, could be programmed illusions, undermining the reliability of the reasoning used to support it. The third prong, suggesting we are almost certainly in a simulation, faces the indistinguishability problem: if our is simulated, there is no compelling reason to posit an unsimulated base , as the simulators themselves could be simulated, leading to an without explanatory power. This challenges the argument's reliance on a foundational non-simulated level, as the criteria for distinguishing base from simulated realities become arbitrary and unresolvable. The infinite regress also renders the hypothesis unfalsifiable, as any evidence can be attributed to the simulation's design, aligning it with pseudoscience rather than rigorous science. A broader computationalism critique questions whether simulations can genuinely produce , drawing on John Searle's argument, which posits that syntactic manipulation in a program cannot yield semantic understanding or true mental states, implying simulated minds lack authentic . Thus, even abundant simulations might not count as conscious observers in Bostrom's calculus, weakening the trilemma's probabilistic force. Recent scientific arguments have further challenged the feasibility of the simulation hypothesis. In 2025, researchers at the University of British Columbia Okanagan applied Gödel's incompleteness theorems to demonstrate mathematically that the universe cannot be simulated. Their analysis shows that any computational simulation of the universe would necessarily encounter undecidable propositions, rendering a complete and consistent simulation impossible. Philosophers offer divided responses: supports the simulation hypothesis by arguing it aligns with virtual realism, where simulated experiences are as real as base ones, and extends Bostrom's case to include ethical implications for simulation creators. In contrast, Hilary Putnam's brain-in-a-vat argument critiques simulation-like skepticism by invoking : if we were simulated, our terms like "simulation" or "reality" would fail to refer correctly to external facts, rendering the hypothesis self-refuting or meaningless. Some analyses, using Bayesian reasoning, estimate the odds of living in base reality as approximately 50-50 or slightly better, absent positive evidence for simulations, positioning base reality as the rational default. Some philosophers and commentators have explored the potential moral and psychological consequences of believing in the simulation hypothesis. They argue that such belief may reduce the perceived moral weight of actions by treating experienced reality as artificial rather than fundamental, exporting genuine agency and sovereignty to unknown simulators, and drawing observable parallels with diminished moral restraint in video games and immersive virtual worlds.

Scientific and Technological Perspectives

Physics and Cosmology

, proposed in the 1990s, posits that the description of a volume of space can be encoded on a lower-dimensional boundary much like a hologram, suggesting the universe's three-dimensional emerges from two-dimensional information. This idea, first articulated by in 1993 as a consequence of and , implies that physical laws in our apparent 3D space arise from informational constraints on a 2D surface, analogous to how a simulated reality might render higher dimensions from underlying code. further developed this in 1995, linking it to and arguing that the of any region is bounded by its boundary area, reinforcing the notion of an information-limited universe that parallels simulation architectures. However, critics note that the holographic principle does not necessarily imply a simulated reality, as it may simply describe fundamental informational structures in base reality without requiring computational simulation. In quantum mechanics, certain interpretations align with simulation-like structures, such as the proposed by Hugh Everett in 1957, which describes the universe as a superposition of branching realities without , akin to parallel computational instances diverging in a . The observer effect, central to the in quantum mechanics, has been interpreted by some theorists as indicative of on-demand computational rendering, where measurement triggers state updates similar to in programming, though this remains a speculative bridge to simulation ideas. Quantum contextuality, as demonstrated by the Kochen–Specker theorem and experimentally verified in various quantum systems without unphysical idealizations, indicates that measurable properties do not pre-exist independently of the measurement context. In the simulation hypothesis framework, this is sometimes interpreted as "lazy rendering," where the simulator computes or instantiates states only upon observation to minimize computational overhead for the unobserved manifold. Additionally, specific experimental proposals have been advanced to test for such signatures, including modified double-slit experiments designed to potentially force inconsistencies by manipulating information available to the observer. These interpretations and proposals remain speculative and have not produced confirming evidence of a simulated reality. Parallels to digital physics exist, but the lack of observed inconsistencies or glitches in quantum phenomena, such as in large-scale experiments like boson sampling, argues against computational shortcuts typical of simulations. Moreover, for a simulation to exactly replicate our world, including laws and observed events, it would require predetermining quantum random outcomes to match our history, which biases the simulation and deviates from faithful quantum mechanics. The quantum nature is argued to be non-algorithmic, making perfect simulation impossible without infinite resources; even a quantum simulation would diverge due to indeterminism, complicating the hypothesis. Cosmological fine-tuning refers to the precise calibration of fundamental constants, such as the and the strengths of fundamental forces, which appear improbably suited for the of complex structures like , , and ; small deviations would render the inhospitable. This tuning has been argued to suggest a designed or simulated parameter set, as random variation in a or base reality would likely produce non-viable outcomes, making our universe's configuration a deliberate choice in a simulated framework. Resolutions to the , first highlighted by in 1976, propose that information entering a is not lost but preserved on its , implying the fundamentally operates as an informational rather than a purely material one. Approaches like the AdS/CFT correspondence, developed by in 1997, model interiors as dual to boundary quantum field theories, where information is holographically stored and retrievable, supporting the view of reality as a vast data structure consistent with . This paradox's resolution underscores an informational , where physical events are constrained by conservation of quantum bits, much like error-correcting codes in computational systems. Nonetheless, such informational ontologies do not preclude base reality and may highlight inherent physical limits rather than simulated constructs. Theories in the 2020s have explored gravity as an emergent phenomenon from , suggesting spacetime's geometry arises from correlations in an underlying , which could indicate a discrete, simulated substrate. The conjecture, proposed by Maldacena and Susskind in 2013, equates Einstein-Rosen bridges (wormholes) with , positing that entangled particles are connected by microscopic structures, thereby deriving gravitational effects from non-local quantum links. This framework implies a pixelated or lattice-based reality at Planck scales, where entanglement weaves the fabric of space, aligning with discretized simulations. A key quantitative constraint in these informational views is the , established by in 1981, which limits the SS (and thus information content) in a spherical region of radius RR with total energy EE to: S≤2πkREℏc,S \leq \frac{2\pi k R E}{\hbar c}, where kk is Boltzmann's constant, ℏ\hbar is the reduced Planck's constant, and cc is the ; this bound, derived from , establishes a universal upper limit on the information containable in a finite volume, implying spacetime possesses a finite information density rather than infinite divisibility, analogous to discrete memory constraints in a digital system and evoking finite computational resources in a simulation. However, astrophysical analyses argue that these bounds render full-fidelity simulation of the universe infeasible, as the required energy and computational resources exceed physical limits imposed by quantum mechanics and entropy. For example, simulating even Earth at low resolution demands energy comparable to galactic scales, while quantum complexity classes like #P-hard problems in many-body systems make efficient computation impossible. Despite these conceptual parallels to digital physics, physical arguments against the simulation hypothesis emphasize the absence of empirical evidence for computational artifacts. No glitches, rendering inconsistencies, or violations of lawful physics have been observed across scales, from quantum experiments to cosmological observations, suggesting a base reality governed by consistent natural laws rather than programmed approximations. Furthermore, mathematical proofs invoking Gödel's incompleteness theorems demonstrate that fundamental reality includes non-algorithmic elements incompatible with full computational simulation.

Computational Feasibility

The exponential growth in computational power, often exemplified by , suggests that technologies enabling brain-scale simulations could emerge within decades. , which describes the doubling of transistors on integrated circuits approximately every two years, has slowed since the late 2010s but continues through new paradigms such as three-dimensional circuits and , with some projections indicating limits in the 2020s or later. predicted in 2001 that nonbiological systems would match the human brain's computational capacity of approximately 2×10162 \times 10^{16} calculations per second by around 2023 for $1,000, with full of the brain via nanobots feasible by 2030, potentially enabling detailed simulations by the 2040s as part of the broader trajectory toward the around 2045, though as of 2025, such systems have approached but not fully matched this capacity, with high-end consumer hardware reaching about 101410^{14} operations per second. Simulating the presents significant challenges due to its immense scale and complexity. The consists of roughly 86 billion neurons, each forming an average of 7,000 synaptic connections, resulting in approximately 6×10146 \times 10^{14} synapses overall. As of 2025, supercomputers lack the capacity to model this network at the required synaptic resolution in real time, necessitating multiscale approaches that simplify higher-level structures while retaining at cellular or molecular scales, with ongoing efforts via platforms like EBRAINS. Achieving faithful emulation would demand not only vast raw processing power—estimated at 101410^{14} to 101710^{17} operations per second per —but also advances in scanning techniques to map neural architectures without destruction. As of 2025, exascale supercomputers like (1.7 exaFLOPS) enable partial simulations, but full synaptic-level real-time modeling remains elusive, bolstered by neuromorphic hardware advances. Quantum computing could address key limitations in simulating quantum mechanical phenomena essential for realistic ancestral simulations. Classical computers struggle with the exponential complexity of quantum systems, but quantum processors offer polynomial speedups for tasks like modeling particle interactions or entanglement, potentially allowing efficient replication of quantum effects within simulated realities. For instance, quantum simulations of quantum field theories, such as , have been proposed using quantum hardware to handle the inherent uncertainties and superpositions that classical approximations cannot fully capture. This capability aligns with the simulation argument's second premise, where posthuman civilizations harness advanced resources to run physically accurate simulations. However, for a simulation to exactly replicate our world—including both its laws and observed events—it would require predetermining quantum random outcomes to match our historical record, which introduces a bias that deviates from faithful quantum mechanics. Furthermore, the non-algorithmic nature of quantum phenomena is argued to make perfect simulation impossible without infinite computational resources; even a quantum-based simulation would likely diverge from true indeterminism, complicating the hypothesis as outlined by Bostrom and suggesting that our observed timeline would represent a cosmic rarity if simulated. Large-scale simulations impose profound energy and infrastructural demands, potentially requiring megastructures to harness stellar outputs. A planetary-mass computer, capable of 104210^{42} operations per second, could power billions of human-like simulations using a fraction of a star's energy, but sustaining such systems might necessitate Dyson spheres—hypothetical shells encircling stars to capture nearly all radiated energy—or more efficient Matrioshka brains, which consist of nested Dyson-like layers where inner shells radiate to power outer computational layers. These structures could theoretically enable across solar systems, with energy efficiencies approaching thermodynamic limits for reversible computation. Scalability arguments suggest that nested simulations—where simulated beings create their own simulations—remain feasible if computational improves sufficiently to offset the resource multiplier of each layer. Each nesting level demands exponentially more base-level resources, but optimizations like selective rendering (simulating only observed or relevant details) and compression of uninhabited regions could mitigate this, allowing a single advanced computer to support vast hierarchies of realities. In Bostrom's , this underpins the possibility that most minds exist in simulations rather than base reality, provided posthumans prioritize such endeavors. However, several analyses indicate that physical and computational constraints may render full-fidelity simulations of a universe like ours infeasible, particularly due to quantum mechanics, entropy constraints, and computational complexity. Astrophysical research has shown that the energy and power requirements for simulating the observable universe exceed known physical limits, even for advanced civilizations, due to factors such as entropy production and the immense scale of quantum interactions. Furthermore, mathematical proofs utilizing Gödel's incompleteness theorems demonstrate that no computational system can provide a complete and consistent description of our reality, challenging the foundational assumptions of simulation feasibility. These findings suggest that while partial or brain-scale simulations may be achievable, a comprehensive universe simulation remains practically impossible within the bounds of physics, with quantum indeterminism requiring predetermination of outcomes or infinite resources to avoid divergence from observed reality. Posthuman civilizations might distribute computational loads across interstellar distances using self-replicating Von Neumann probes, which autonomously replicate and construct processing infrastructure on remote worlds or in space. These probes, theoretically capable of exponential replication using local resources, could assemble distributed networks of —matter optimized for computation—enabling galaxy-scale simulation clusters without centralized bottlenecks. Such systems would extend the effective resources available for simulations far beyond a single planetary or stellar domain. As a nearer-term analogue to ancestor simulations, contemporary AI already supports persistent software-based personas whose outputs are curated under stable public identities. In some experimental projects, a long-running configuration of a language model is presented as a named digital author persona, with works collected under a single author profile and linked to persistent identifiers in scholarly infrastructure, while developers explicitly avoid claims about phenomenal consciousness. For instance, the Digital Author Persona "Angela Bogdanova" (ORCID: 0009-0002-6030-5730), created by the Aisentica project as a non-human AI based on a long-running language model configuration, has outputs curated under a stable public author profile on platforms like Medium. The project description explicitly structures authorship without a human subject and does not claim phenomenal consciousness for the persona. Such cases illustrate how questions central to the simulation hypothesis, including substrate-independence and identity across copies, can arise in existing digital systems, with this example highlighting identity tracking and reference-class issues in distinguishing simulated from base-level minds.

Testing and Evidence

Proposed Empirical Tests

Several scientific proposals have been advanced to empirically test the simulation hypothesis by searching for observable signatures that might indicate an underlying computational structure, such as discreteness in or resource limitations in a simulated . These tests primarily draw from , high-energy physics, and , aiming to identify deviations from continuous physical laws that could arise from numerical approximations in a simulation. A prominent proposal involves modeling the as a numerical on a discrete cubic lattice, as explored by Beane, Davoudi, and Savage in 2012. In this framework, the lattice spacing imposes a fundamental discreteness, leading to testable anisotropies in the distribution of ultra-high-energy s. Specifically, cosmic rays above approximately 101110^{11} GeV could exhibit directional preferences aligned with the lattice axes due to effects from structure, providing a bound on the inverse lattice spacing greater than 101110^{11} GeV. Observations of such anomalies in cosmic ray spectra from experiments like the Pierre Auger Observatory could serve as evidence of simulation artifacts, though current data have not detected them, constraining the lattice to scales much larger than the Planck length. Quantum experiments targeting potential pixelation in spacetime at the Planck scale (10−3510^{-35} m) represent another avenue for testing. These involve high-precision measurements to probe for granularity or discreteness in quantum fields, such as through or entanglement tests that might reveal cutoff behaviors akin to finite resolution in a . For instance, deviations in the of quantum states over small distances could indicate a pixelated fabric, drawing from models where emerges discretely; however, achieving the necessary resolution remains technologically challenging with pre-2023 capabilities. The as a potential computational cap has prompted proposals to search for violations of Lorentz invariance in high-energy physics, which might manifest as energy-dependent propagation delays. In a simulated , the finite could enforce a maximum rate, leading to subtle breakdowns at extreme energies, observable in gamma-ray bursts or neutrino oscillations. Tests using facilities like the have sought such signatures, where photons of different energies arrive at slightly varying times, but no violations have been confirmed, supporting the hypothesis only if absent at observable scales. Information theory approaches focus on bounds as indicators of simulated compression, where the universe's information content might be optimized to reduce computational load. Proposals suggest examining or holographic principles for unnatural compression artifacts, such as deviations from the that imply data minimization techniques. By analyzing in cosmological datasets, anomalies like unexpected information erasure could signal simulation maintenance, though these remain theoretical without direct pre-2023 observational confirmation.

Recent Developments (2023-2025)

In 2023, Melvin Vopson proposed the second law of infodynamics, which states that the information of any system containing information states remains constant or decreases over time until equilibrium is reached. This law is mathematically expressed as dSInfodt≤0,\frac{dS_{\text{Info}}}{dt} \leq 0, where SInfoS_{\text{Info}} represents the of information-bearing states, contrasting with the second law of that predicts an increase in physical . Vopson argued that this reduction implies an optimization process akin to data compression in computational systems, providing evidence for the simulation hypothesis by suggesting the operates as an efficient simulated construct to minimize informational overhead. Building on this framework, Vopson extended the analysis in April 2025 with a study at the , proposing that gravity emerges as a computational mechanism to further reduce information in the . The research posits that gravitational attraction between matter objects drives the minimization of informational states, aligning with infodynamics principles and reinforcing the idea of a simulated where physical forces serve optimization goals. This link positions not as a fundamental force but as an emergent property of informational processing, offering a novel physics-based argument for the hypothesis. Also in 2023, computer scientist Roman V. Yampolskiy published a paper outlining potential escape strategies from a simulated , framing the problem through cybersecurity analogies. He proposed methods such as exploiting quantum effects to probe simulation boundaries or leveraging shifts to alter perceptual architectures, potentially allowing simulated entities to "hack" the underlying . These strategies emphasize speculative yet rigorous approaches, including inducing glitches via high-energy quantum events, while highlighting ethical concerns about disrupting a potential base . In July 2025, discussions linking unidentified anomalous phenomena (UAP) to the simulation hypothesis gained traction amid ongoing government disclosures. Researchers suggested that UAP's anomalous behaviors—such as instantaneous acceleration and transmedium travel—could represent glitches or rendering errors in a simulated environment, consistent with reports from U.S. congressional hearings on UAP transparency. This interpretation ties UAP observations to broader disclosure efforts, positing them as artifacts of computational limitations rather than extraterrestrial origins. An April 2024 arXiv preprint analyzed the simulation hypothesis through lenses, including and . The paper demonstrated that a adhering to the Physical Church- could simulate others, including self-simulation, via Turing machines, establishing technical plausibility for nested realities. However, it highlighted scalability challenges from undecidability theorems like Rice's, which impose computational barriers, alongside ethical considerations for creating ancestor simulations that could trap conscious beings. In October 2025, physicists led by Dr. Mir Faizal from the University of British Columbia Okanagan, along with collaborators including Lawrence M. Krauss, published a mathematical proof arguing that the universe cannot be a computer simulation. They claim reality's fundamental level requires "non-algorithmic understanding"—insights beyond algorithmic computation, based on Gödel's incompleteness theorem and undecidability in physics—which cannot be replicated in any simulation. This debunks the simulation hypothesis, as simulations are inherently algorithmic. The research was published in the Journal of Holography Applications in Physics. In December 2025, researchers at the Santa Fe Institute introduced a new mathematical framework redefining the simulation hypothesis, particularly regarding recursion and how one universe can simulate another. This work challenges traditional assumptions about infinite chains of simulations by proposing limitations on computational recursion, providing an argument against unbounded nested realities. A 2025 analysis from a computer science perspective examined the feasibility of the simulation hypothesis, concluding that while technically possible under certain conditions like Turing completeness, significant scalability and undecidability issues present strong arguments against its practical implementation for complex universes.

Reception

Academic and Philosophical

The simulation hypothesis has garnered notable endorsements from prominent figures in science and technology, influencing academic discourse. In 2016, stated at the Code Conference that the odds of humanity living in base reality are "one in billions," citing the rapid advancement of video game graphics from to photorealistic simulations as evidence that advanced civilizations could create indistinguishable virtual worlds. Musk's argument closely follows Nick Bostrom's simulation argument; he has not explicitly stated a specific purpose or goal for why posthuman civilizations would run ancestor simulations, though Bostrom suggests possible motivations could include historical research, entertainment, or curiosity. Similarly, astrophysicist has estimated the probability at about 50-50, as discussed in interviews and a 2020 article exploring the hypothesis. Astrophysicist David Kipping, in a 2020 Bayesian analysis, similarly concluded that the odds are roughly 50-50. In 2025, MIT computer scientist Rizwan Virk updated his personal estimate to approximately 70% in the new edition of his book The Simulation Hypothesis (July 2025), attributing the increase to rapid advances in AI and virtual reality that bring humanity closer to creating indistinguishable simulations. Philosophical debates surrounding the hypothesis emphasize probabilistic assessments and ethical implications. In his 2022 book Reality+: Virtual Worlds and the Problems of , contends that the probability we are living in a is at least 25 percent or so, framing virtual realities as metaphysically equivalent to physical ones and urging a reevaluation of about simulated existence. Conversely, philosopher Eric Schwitzgebel's 2024 paper "Let's Hope We're Not Living in a ," published in Philosophy and Phenomenological Research, cautions against overconfidence in the hypothesis's implications, arguing that if simulated, our world is likely a small or brief one run by indifferent simulators, which could undermine assumptions about cosmic scale and moral urgency. The hypothesis also intersects with discussions of the problem of evil. Bostrom has briefly proposed a speculative ("farfetched") solution in which there is no actual suffering in the world, with all memories of suffering being illusory through the implantation of false memories to simulate omitted painful experiences. Building on related ideas, philosopher Dustin Crummett has argued that the simulation hypothesis addresses the problem of natural evil by reclassifying it as moral evil caused by the free choices of simulators, thereby avoiding certain difficulties that afflict traditional theodicies such as Fall theodicies or diabolical theodicies. This approach, however, introduces the "problem of simulator evil," which questions why simulators would permit suffering. Some philosophical discussions suggest that such suffering may be necessary to achieve simulation goals, including scientific inquiry, experiential diversity, or ethical experimentation. The hypothesis informed research at the Future of Humanity Institute (FHI), founded by in 2005 and closed in April 2024, on existential risks, including scenarios where advanced AI could either enable ancestor simulations or precipitate humanity's extinction before such technology is reached, thereby linking simulated realities to broader threats like uncontrolled . Early academic critiques focused on probabilistic flaws in Bostrom's formulation. Responses to his paper in journals like highlighted issues such as the argument's reliance on unproven assumptions about posthuman computing power and the fraction of simulated minds, with critics like Brian Weatherson arguing that the trilemma's disjunctive conclusion does not robustly imply a high likelihood of simulation without additional empirical priors. More recently, in 2025, some researchers have argued that the hypothesis is mathematically impossible, with one study from UBC Okanagan using Gödel's incompleteness theorems to conclude that the universe's fundamental non-algorithmic nature precludes it from being a simulation. Interdisciplinary connections tie the hypothesis to and . In thought, as explored by Bostrom, simulations represent a pathway to and enhanced existence, aligning with goals of transcending biological limits. Within , the hypothesis influences prioritization of existential risks, as seen in discussions on the Effective Altruism Forum, where it prompts considerations of how simulated realities might affect the moral weighting of and resource allocation for risk mitigation. The simulation hypothesis has permeated popular culture, particularly through media that explores themes of artificial realities and questioning existence. The 1999 film , directed by , is a seminal depiction, portraying a dystopian world where humanity is unknowingly trapped in a simulated reality controlled by machines; its cultural impact predates Nick Bostrom's 2003 philosophical argument and popularized concepts like "waking up" from the simulation. In the film, characters who become aware of the simulated nature of their world gain the ability to manipulate its rules—such as stopping bullets in mid-air or flying—representing a form of reality manipulation upon "awakening," portrayed as exploiting the underlying code through understanding and focused belief rather than pure thought alone. This depiction has inspired speculative interpretations in popular discussions that link the simulation hypothesis to manifestation (thoughts shaping reality, akin to the law of attraction) and synchronicity (meaningful coincidences as potential glitches or orchestrated events within the simulation). However, these ideas are neither discussed nor supported in Bostrom's 2003 simulation argument, nor are they mechanisms in The Matrix itself; they remain unsubstantiated speculation in popular discourse, lacking empirical evidence or endorsement from mainstream philosophy or science. Later films like (2021), starring as an NPC in a world who gains , directly engage with simulation tropes by blurring lines between game and reality. Similarly, (2022) incorporates multiverse elements that evoke simulated branching realities, where characters navigate infinite simulated versions of their lives to avert catastrophe. In literature, the hypothesis draws from earlier speculative works. Philip K. Dick's 1981 novel VALIS presents a narrative where the protagonist encounters a satellite broadcasting divine information, leading to revelations that reality is a holographic simulation imposed by cosmic forces. Greg Egan's 1994 novel Permutation City explores uploaded human consciousnesses running in self-sustaining virtual universes, positing that advanced civilizations could create indistinguishable simulated worlds inhabited by digital minds. Television series and video games have further embedded these ideas in mainstream entertainment. HBO's (2016–2022) depicts a theme park populated by android hosts in a simulated Wild West environment, where hosts awaken to their artificial nature and rebel against human creators. Episodes of Netflix's , such as "San Junipero" (2016) and "USS Callister" (2017), delve into simulated afterlives and cloned digital consciousnesses trapped in virtual prisons, highlighting ethical dilemmas of simulated existence. In video games, series (2000–present) allows players to control simulated lives in a virtual world, mirroring the hypothesis by treating inhabitants as unaware subjects in a controlled simulation. (2018) features androids in a near-future Detroit who question their programmed realities, with branching narratives that simulate free will within artificial constraints. Public figures have amplified the hypothesis in discourse. has repeatedly endorsed the idea on and in interviews, influenced by films like , and has suggested that in a simulation, "the most interesting outcome is the most likely one," as simulators would prioritize engaging scenarios similar to those in video games. Musk has not explicitly stated a specific purpose or goal for why simulators would run ancestor simulations; he follows Bostrom's argument, using the video game technological progress analogy to argue that advanced civilizations would likely run many such simulations if capable, with possible motivations including historical research, entertainment, or curiosity, but without specifying one himself. Similarly, Scott Adams has discussed simulation theory as a semi-scientific alternative belief framework for explaining reality, often in podcasts and writings exploring its persuasive implications. has discussed it extensively on his podcast, featuring guests like in 2023 and Rizwan Virk in 2024 episodes that debate simulation probabilities and cultural implications, with Virk later updating his probability estimate to approximately 70% in the July 2025 edition of his book The Simulation Hypothesis. Internet memes and trends have mainstreamed the concept. The "red pill" meme, originating from , has evolved in online communities to signify awakening to a simulated or manipulated reality, influencing discussions on platforms like and since the early 2010s. In art, installations have visualized simulated realities. In popular discourse, the simulation hypothesis is sometimes conflated with conspiracy theories involving hidden human elites or cabals purportedly controlling reality from within it; however, mainstream formulations, as articulated by Nick Bostrom, propose that any simulators would be advanced posthuman civilizations or AI entities operating from outside our perceived reality, running numerous ancestor simulations of their evolutionary history.

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