- #1

PJK

- 15

- 0

I want to calculate traces of Dirac matrices with a program like Mathematica.

I found the package FeynCalc but it seems to be outdated.

It is always producing results like this:

Code:

```
4 (-(DiracCanonical->False) (Factoring->False) (FeynCalcInternal->True) g^(mu nu)
(InsideDiracTrace->True) k\[CenterDot]l-l^2 (DiracCanonical->False) (Factoring->False)
(FeynCalcInternal->True) g^(mu nu) (InsideDiracTrace->True)+m^2
(DiracCanonical->False) (Factoring->False) (FeynCalcInternal->True) g^(mu nu)
(InsideDiracTrace->True)+k^nu l^mu (DiracCanonical->False) (Factoring->False)
(FeynCalcInternal->True) (InsideDiracTrace->True)+k^mu l^nu (DiracCanonical->False)
(Factoring->False) (FeynCalcInternal->True) (InsideDiracTrace->True)+2 l^mu l^nu
(DiracCanonical->False) (Factoring->False) (FeynCalcInternal->True)
(InsideDiracTrace->True))
```

Is there a better program/package for doing those calculations?