Recent content by lour

Thanks a lot for all your help.The equation is from one of my homework problems,it is kind of Dirac equation,"introduce an anomalous magnetic monent"-my homework states,:confused:.If you are interested,I can send you the whole problem:smile:(I'm working on it,I bet you won't like it)

It's (\gamma^{\mu}(p_{\mu}-\frac{e}{c}A_{\mu})+\frac{Keh}{4mc^{2}}\sigma_{\mu\nu}F^{\mu\nu}-mc)\Psi=0.I don't know what \sigma_{\mu\nu}F^{\mu\nu} means.F^{\mu\nu}=\frac{\partial_{A^{\mu}}}{\partial_{x_{\nu}}}-\frac{\partial_{A^{\nu}}}{\partial_{x_{\mu}}}.Can someone tell me?Help appreciated

What's the difference between sigma sub i,j and sigma sup i,j??thanks.