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When I read quantum field theory in Weinberg's Volume 1. In equation 2.6.22 :
[tex]P{\Psi _{p,\sigma }} = {\eta _\sigma }\exp ( \mp i\pi \sigma ){\Psi _{{\cal P}p,{-\sigma} }}[/tex]
I don't agree with the [tex]-\sigma[/tex] in the result of space reversal transformation.
Can any one explain it for me?
Thanks
[tex]P{\Psi _{p,\sigma }} = {\eta _\sigma }\exp ( \mp i\pi \sigma ){\Psi _{{\cal P}p,{-\sigma} }}[/tex]
I don't agree with the [tex]-\sigma[/tex] in the result of space reversal transformation.
Can any one explain it for me?
Thanks