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Philosophical Foundations of Physics

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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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An argument for hidden variables

By Bryan 17 May 2010 quantum theory

Detlef Dürr, Shelly Goldstein, and Nino Zanchí once gave a very interesting argument for hidden variables. I’ll give their argument a careful reconstruction. But first, here’s what they say. According…

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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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"An elementary particle ‘is’ an irreducible representation"

By Bryan 20 February 2010 philosophy of physics, quantum theory

A well-known particle physicist’s adage: Ever since the fundamental paper of Wigner on the irreducible representations of the Poincaré group, it has been a (perhaps implicit) definition in physics that an elementary particle…

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Unitary operators and spacetime symmetries

By Bryan 17 February 2010 philosophy of physics, quantum theory, spacetime

In quantum mechanics, certain unitary operators have been understood since the time of Wigner in terms of spacetime symmetries. Why? The foundation for this kind of thinking has an interpretive and…

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