In page 30 of book "An introduction to quantum field theory" by Peskin and Schroeder in the derivation of Klein-Gordon propagator, why p^0=-E_p in the second step in equation (2.54). and why change "ip(x-y)" to "-ip(x-y)"? I thought a lot time, but get no idea. Thank you for your giving me an explanation.(adsbygoogle = window.adsbygoogle || []).push({});

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# Peskin and Schroeder derivation of Klein-Gordon propagator

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