Hello,
I have defined some Tensors L_{mu nu} and W^{mu nu} for example like
Lmunu = FV[l, \[Rho]]*FV[k, \[Sigma]] + FV[l, \[Sigma]]*FV[k, \[Rho]]
Wmunu = FV[pa, \[Mu]]*FV[pa, \[Nu]]
To get the cross section I used Contract[Lmunu*Wmunu] which worked fine. The result now includes some scalar products like pa*k. Now I would like to replace this scalar products by some number. How do I do that? I tried to define e.g.
SP[pa,k]=1
before the Contract[...], but this did not work. Did I forget anything, or is there any other way?
Thank you, Simone
This archive was generated by hypermail 2b29 : 09/04/20-12:55:05 AM Z CEST