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accepted A step in the derivation of the magnetic moment of the electron in Zee's QFT book
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22
comment A step in the derivation of the magnetic moment of the electron in Zee's QFT book
This is basically identical to the answer by A friendly helper and both are correct. I am accepting his answer because he was slightly quicker but many thanks anyway.
Nov
22
comment A step in the derivation of the magnetic moment of the electron in Zee's QFT book
Right. I guess I was blinded by the appearance of $\partial_\mu A_\nu - \partial_\nu A_\mu$ so I forgot that the $\partial$s were still operating on everything to their right. Thanks.
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asked A step in the derivation of the magnetic moment of the electron in Zee's QFT book
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comment Why are Saturn's rings so thin?
In inelastic collisions between the ring particles angular momentum is preserved but kinetic energy is lost. So the final rotation axis of the rings is given by their initial angular momentum but it is the dynamical evolution of the rings that makes them flat and thin.
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answered Why are Saturn's rings so thin?