Last year I had a back-and-forth Abhay Ashtekar. It was during a lively conference organised by Emily Grosholz and hosted by the Center for Gravitaiton and the Cosmos where Ashtekar is director. Our discussion…

Read more## Bohmian Indeterminism

Bohmian mechanics is not just an “interpretation” of quantum mechanics. It is a radical revision. In this note, I’d like to point out one reason that it’s an implausible revision:…

Read more## Spatial translations in quantum mechanics

I remember that when I first learned the Canonical Commutation Relations in quantum mechanics, they seemed mysterious: I knew I was supposed to view this as a law…

Read more## Pauli’s Theorem is not a theorem (not as Pauli stated it)

There is a quirk in the literature on time-energy uncertainty. It might have started as a little sloppiness. But it has grown into an error that seems to have spread…

Read more## 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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