Name: George Katsianis Date: 09/30/19-12:06:11 PM Z
Hi,
I am new to Feyncalc and I am facing the following problem. I am doing
the following:
I set `q3=-q2-q1;`
Then I write
Pair[LorentzIndex[k],
Momentum[q3]] - (-Pair[LorentzIndex[k],
Momentum[q2]] -
Pair[LorentzIndex[k], Momentum[q1]])) //
DiracReduce
and I get
FV[q1, k] + FV[-q1 - q2, k] + FV[q2, k]
Now if I multiply the above with a gamma matrix, let’s say for instance GA5 i.e.
(Pair[LorentzIndex[k],
Momentum[q3]] - (-Pair[LorentzIndex[k],
Momentum[q2]] -
Pair[LorentzIndex[k], Momentum[q1]])))GA5
// DiracReduce
I get zero as I am supposed to find.
Is this is bug? I cannot make the first expression equal to zero,but
when I multiply it with something else then mathematica shows that it is
indeed zero. Similar things happen with more complicated expressions.
Thank you