Polarization tensor/custom tensor

[feyncalccc]

For higher spin particles(gravitons for example), the polarization state will be described by a tensor rather than a vector. I'm wondering if there is a standard way to treat such polarization tensors(and higher rank tensors in general), namely to declare a tensor and apply constraints to it (transverse traceless, etc). Thanks a lot!!

[feyncalccc]

I think I know the answer. Since polarization vector is a builtin function of feyncalc, one construct a polarization tensor of any rank by putting together polarization vectors. For example, epsilon_[Mu][Nu](p) = epsilon_[Mu](p) epsilon_[Nu](p).

Corrections and supplementary answers are still welcome and appreciated.

[vsht]

DoPolarizationSums just uses Uncontract, Contract and a bunch of replacement rules to implement the polarization sum formulas. You
can simply write your own function for arbitrary tensors using those commands.