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HomogenousCow
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On page 59 of Peskin & Schroeder, there's a section on the lorentz transformation of field operators which I've attached. I'm confused about the part towards the end where he does a change of variable on the integration measure; it seems like he's only rewriting the lorentz-invariant integration measure in terms of the boosted momentum, and not the rest of the integrand. Why is this allowed? Surely the integral has to be boosted together.
EDIT: Nevermind, just wasn't thinking about it the right way
EDIT: Nevermind, just wasn't thinking about it the right way
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