we experienced some problems with the Levi-Civita tensor in the latest version (5 beta1) of FeynCalc which didn't exist in version 4.1.1
If I enter for example
Contract[Eps[LorentzIndex[a], LorentzIndex[b], LorentzIndex[c], LorentzIndex[d]]*FV[p, a]*FV[p + q, b]]
that works in the old version and it throws away the part where p is contracted with two indeces of the Eps tensor.
In the new version however it does not do that. Is there any quick fix for it or can I first use something like
ScalarProductExpand before contracting?
Besides, I found that ScalarProductExpand[FV[p + q, a]] gives different results in version 5 beta1, it does not add the Lorentz index a to both parts as it used to do in version 4.1.1
Unfortunately we need the features of 5 beta1 for our current programs, so is there any way to make FeynCalc 5 beta1 contract the epsilon tensors correctly?
Thank you very much for your help!!!
This archive was generated by hypermail 2b29 : 03/29/17-07:20:02 AM Z CEST