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Commutation relation of $P^{\mu}$ with fermion field $\psi(x)$
On Giunti and Kim's book "Fundamentals of neutrino physics and astrophysics", page 38-39, the book is trying to derive the commutation relation of $P^{\mu}$ and $\psi(x)$.
Begin with:
$$ U\...
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Is absolute motion inconsistent with homogenous space? [closed]
I read that homogenous space implies conservation of momentum (according to Noether's theorem) Conservation of momentum is kinda the statement that bodies continue moving with constant velocity unless ...
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