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Living_Dog
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Ryder, QFT, 1985, pg. 40, Eq. (2.69) K = sigma??
For the similar page in the 2nd edition, turn page 37 at this http://books.google.com/books?id=nn...resnum=1&ved=0CCwQ6wEwAA#v=onepage&q&f=false".
He states that K = +/- i/2 sigma.
How is this possible since the Pauli matrices are 2x2's and the K's are 4x4's. So ok, maybe he doubled up on the sigma's, but still, K_x != sigma_x, etc.
Thanks in advance.
For the similar page in the 2nd edition, turn page 37 at this http://books.google.com/books?id=nn...resnum=1&ved=0CCwQ6wEwAA#v=onepage&q&f=false".
He states that K = +/- i/2 sigma.
How is this possible since the Pauli matrices are 2x2's and the K's are 4x4's. So ok, maybe he doubled up on the sigma's, but still, K_x != sigma_x, etc.
Thanks in advance.
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