Name: Vladyslav Shtabovenko (email_not_shown)
Date: 05/04/17-12:37:23 PM Z


Hi,

I never needed this myself, but I guess there is no point why it should
not be available.

So I improved MomentumCombine to handle Eps tensors as well, such that

MomentumCombine[LC[][a, b, c, p] + LC[][a, b, c, q]] // FCE

gives

LC[][a, b, c, p + q]

One can also disable this via the LC->False option. Then

MomentumCombine[LC[][a, b, c, p] + LC[][a, b, c, q],LC->False]

returns

LC[][a, b, c, p] + LC[][a, b, c, q]

It is already the development branch of FeynCalc 9.3 that I hope to
release soon. You can test it via

Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"]
InstallFeynCalc[InstallFeynCalcDevelopmentVersion -> True]

Cheers,
Vladyslav

Am 02.05.2017 um 18:15 schrieb Pablo Sanchez Puertas:
> Hello and, first of all, thanks for the support.
>
> I was doing some traces in D=4 dimensions and the presence of a GA5 matrix results in a sum Levi-Civita tensors.
> I would like to simplify a bit the expression when expressions of the following kind appear:
>
> LC[a,b,c,p] + LC[a,b,c,q] -> LC[a,b,c,p+q]
>
> This is not achieved via Simplify[] and I was wondering whether an existing function performing such a task already exists in FeynCalc or whether I should do it myself (I could not find any).
>
> Thanks in advance,
> Pablo
>



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