Recent content by Goose

apply the following identity \gamma\mu\gamma\nu\gamma\lambda = g\mu\nu\gamma\lambda+g\nu\lambda\gamma\mu-g\nu\lambda\gamma\mu-i\epsilon\sigma\mu\nu\lambda\gamma\sigma\gamma5

Good suggestions. Thank you all. I'll try it again.

Thanks. My step function is the same as what CompuChip described. I know the exact analytical meaning of this function. But my question is how to define this function by Fortran or other computation language. In my research, I simply wrote subroutine using if statement as CoompuChip said. But...

Hi, Friends How to numerically do with step function? I mean, this function is very sensitive to the precision. For example, f(x) is a step function. When x is greater than some very small positive number, \delta, the numerical answer is 1, which agrees with the expected value. But when x <...