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Philosophical Foundations of Physics

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What is a superselection rule?

By Bryan 25 July 2013 quantum theory, time reversal
What is a superselection rule?

A superselection rule is a special limitation on what is observable in the quantum world. For example, we can never seem to observe interference from the relative phases between a…

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Writing a book on time reversal

By Bryan 15 June 2013 alleged book
Writing a book on time reversal

So, I’m writing a book on the foundations of time reversal. I’ve decided to bring back the Soul Physics blog to talk about the book as it’s being written, and…

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CPT: The ‘Intuitive’ Approach

By Bryan 14 June 2010 quantum theory, spacetime, time reversal

Khriplovich and Lamoreaux (1997, §2) suggest a very interesting argument that CPT provides the correct notion of “complete reversal” in physics. The background assumption is that “complete reversal” should have…

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Wigner’s elegant characterization of time reversal

By Bryan 25 March 2010 time reversal

There’s a nice post at The Eternal Universe illustrating discrete symmetries like time reversal. The father of this idea, Eugene Wigner, actually gave a very elegant characterization in his 1931…

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David Albert on symmetries of motion in quantum mechanics

By Bryan 17 March 2010 quantum theory, time reversal

In Time and Chance, David Albert writes that since the Schrödinger equation involves a first (instead of a second) derivative, “the dynamical laws that govern the evolutions of quantum states in…

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