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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 No Comments
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 6 Comments
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 8 Comments

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 6 Comments

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 8 Comments

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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