In FeynCalc 9.0 it works out of the box
Contract[TensorFunction[t, a, b] FV[p, b]];
Uncontract[%, p, Pair -> All]
-> Pair[LorentzIndex[$AL$2154[1]], Momentum[p]] t[LorentzIndex[a],
LorentzIndex[$AL$2154[1]]]
Cheers,
Vladyslav
>
>
> Hello,
>
> is there some way to uncontract indices in tensor functions? Uncontract with Pair->All seems to only work for scalar products of vectors. Here is an example:
>
> Contract[TensorFunction[t, a, b] FV[p, b]];
> Uncontract[%, p, Pair -> All]
>
> gives t(a,p). I did not find a way to separate the tensor from the vector once they are contracted unless I explicitly perform a replacement on the full form, something like:
>
> t[LorentzIndex[a_],Momentum[p_]]->TensorFunction[t,a,b]FV[p,b]
>
> Is there some more straightforward and systematic way to do this?
> Thanks!
>
> Tomas Brauner
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