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kexue
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In A. Zee "QFT in a nutshell" in chapter I.5 on page 31 how does equation (3) come about? Just the line above this equation, he gives an equation which needs to be rearranged to give (3). It must be embarrassing simply, but I can't see how. Something with the indices goes on. How does the -g-kk/m^2 gets on the numerator, why and how kk/m^2??
If you don't own the book, http://press.princeton.edu/chapters/s7573.pdf" with page 31 and equation (3).
thank you
If you don't own the book, http://press.princeton.edu/chapters/s7573.pdf" with page 31 and equation (3).
thank you
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