The principle of mutability is the notion that any physical property which appears to follow a conservation law may undergo some physical process that violates its conservation.^[1][2][3] John Archibald Wheeler offered this speculative principle after Stephen Hawking predicted the evaporation of black holes which violates baryon number conservation.^[4]

1. ^ John Wheeler - Principle of mutability (Part 2) (89/130), October 6, 2017, archived from the original on 2021-12-12
2. ^ John Archibald Wheeler (1973), "From Relativity to Mutability", The Physicist’s Conception of Nature, pp. 202–247, doi:10.1007/978-94-010-2602-4_9, ISBN 978-94-010-2604-8
3. ^ Richard A. Matzner (2010), General Relativity and John Archibald Wheeler, Springer Science & Business Media, p. 34, ISBN 9789048137350
4. ^ Kip S. Thorne, ed. (October 28, 1985), "John Archibald Wheeler: A Few Highlights of His Contributions to Physics", Between Quantum and Cosmos, p. 9

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