Name: Kornelija Passek-Kumericki Date: 07/10/06-11:52:16 AM Z
Hi!
Defining ScalarProducts before using Tr
causes my version of FC (4.1.03b) run under (Mathematica 4.2)
to produce incorrect results:
Tr[GAD[a].GSD[P].GAD[b].GSD[P]]
// InputForm
4*(2*Pair[LorentzIndex[a, D], Momentum[P,
D]]*
Pair[LorentzIndex[b, D], Momentum[P, D]] -
Pair[LorentzIndex[a, D], LorentzIndex[b,
D]]*
Pair[Momentum[P, D], Momentum[P, D]])
but
ScalarProduct[p, p] = 0
Tr[GAD[a].GSD[p].GAD[b].GSD[p]] // InputForm
gives
2*DiracGamma[LorentzIndex[a, D], D] .
DiracGamma[Momentum[p, D],
D]*Pair[LorentzIndex[b, D],
Momentum[p, D]]
??!!
Is this a known bug?
Regards,
Kornelija