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?
This archive was generated by hypermail 2b29 : 02/22/18-09:40:01 AM Z CET