**Next message:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Previous message:**KJHealey: "Re: Integrate is wrong after invoke FeynCalc"**Next in thread:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**Rolf Mertig: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**Vladyslav Shtabovenko: "Re: Antisymmetric tensor contracted w 4vectors"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

If I contract an eps with a 4 vector as follows:

Calc[Eps[\[Alpha], \[Beta], \[Gamma], \[Delta]].FV[p,\[alpha]]]

I get what I would expect:

p^\[Alpha] \[Epsilon]^(\[Alpha] \[Beta] \[Gamma] \[Delta])

But when I do a large calculation with a trace:

Calc[Tr[GA[5, \[Alpha], \[Beta], \[Mu], \[Delta], \[Nu], \[Sigma]]].FV[p, \[Alpha]]]

I get something strange, where the p instead of being left as a vector with an index gets absorbed into the eps:

-4 I g^(\[Beta] \[Delta]) \[Epsilon]^(\[Mu]\[Nu]\[Sigma]p) + other terms

Which would be fine, except in my actual application I am contracting two of the same vector with the eps. So when they get raised into the eps like this the eps obviously vanishes.

What can I do to stop this?

**Next message:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Previous message:**KJHealey: "Re: Integrate is wrong after invoke FeynCalc"**Next in thread:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**TC: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**Rolf Mertig: "Re: Antisymmetric tensor contracted w 4vectors"**Maybe reply:**Vladyslav Shtabovenko: "Re: Antisymmetric tensor contracted w 4vectors"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

*
This archive was generated by hypermail 2b29
: 06/18/19-01:00:02 AM Z CEST
*