It has one success can be observable is the result of Prof Dam Thanh Son in physical review letter 2005 about viscosity/entropy ratio in strongly interacting system.
Thank meopemuck. I've read Weinberg again. And I see that the definition of \sigma change in process. Before, he used it as eigenvalue of {J _ {3}}. And then he used it as helicity. That makes me confuse. But now I understand the reason of his definition.
Thank you one more time.
Thank meopemuck. I 've read again. And I see that the definition of Weinberg is little bit change in the process. He used \sigma in {\Psi _{k,\sigma }} as eigenvalue of J_{3} but in {\Psi _{p,\sigma }} is helicity. That makes me confuse.
When I read quantum field theory in Weinberg's Volume 1. In equation 2.6.22 :
P{\Psi _{p,\sigma }} = {\eta _\sigma }\exp ( \mp i\pi \sigma ){\Psi _{{\cal P}p,{-\sigma} }}
I don't agree with the -\sigma in the result of space reversal transformation.
Can anyone explain it for me?
Thanks