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latentcorpse
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In the following online notes,
http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf
at the very top of page 60, I don't follow the two line argument as to why [itex]k^2<0[/itex] - can anybody explain it to me?
Thanks.
http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf
at the very top of page 60, I don't follow the two line argument as to why [itex]k^2<0[/itex] - can anybody explain it to me?
Thanks.