Name: Sam Date: 10/10/16-07:26:26 PM Z
I am trying to evaluate matrix elements separately for the longitudinal and transverse polarizations of outgoing vectors, and this requires contracting against two separate matrices of the polarization sums. If I was evaluating the polarizations together, I would just do Contract[<<>>], but that doesn’t work for what I want to do. So my question is: how do I assign Lorentz indices to these matrices, or otherwise contract these Lorentz tensors?
Thanks for any help!