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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!

**Next message:**Vladyslav Shtabovenko: "Re: assign Lorentz indices to arbitrary matrix"**Previous message:**迟焕: "Evaluate "Contract" using parallelization?"**Next in thread:**Vladyslav Shtabovenko: "Re: assign Lorentz indices to arbitrary matrix"**Reply:**Vladyslav Shtabovenko: "Re: assign Lorentz indices to arbitrary matrix"**Maybe reply:**Sam: "Re: assign Lorentz indices to arbitrary matrix"**Maybe reply:**Sam: "Re: assign Lorentz indices to arbitrary matrix"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

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