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. John Archibald Wheeler offered this speculative principle after Stephen Hawking discovered the evaporation of black holes which violates baryon number conservation.
- John Wheeler - Principle of mutability (Part 2) (89/130), October 6, 2017
- 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
- Richard A. Matzner (2010), General Relativity and John Archibald Wheeler, Springer Science & Business Media, p. 34, ISBN 9789048137350
- Kip S. Thorne, ed. (October 28, 1985), "John Archibald Wheeler: A Few Highlights of His Contributions to Physics", Between Quantum and Cosmos, p. 9