Recent content by wangjiaji

  1. W

    Feynman rules for vector bosons

    I'm learning QFT by reading Lewis Ryder's book, so my question in short is: how he arrives at Eq 7.57 and Eq 7.58? If you don't have the book, the question is: why are there Minkowski metric terms in the Feynman rules for a gauge field coupling to itself? If the answer is complicated, simply...
  2. W

    Does charge change with velocity?

    It is in fact the very fundamental Space-Time which we're living in that changes with Lorentz transformation, so everything relates to length, time, velocity...changes, but as one apple is still transformed into one apple, the charge of a particle will not change, although the charge density...
  3. W

    Is Mark Srednicki's QFT Textbook Worth the Download?

    According to the https://www.amazon.com/review/product/0521864496/ref=dp_top_cm_cr_acr_img?_encoding=UTF8&showViewpoints=1"&tag=pfamazon01-20 on Amazon, it's pretty good. Download it http://www.physics.ucsb.edu/~mark/qft.html".
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