DiracMatrix[mu]
denotes a Dirac gamma matrix with Lorentz index .
DiracMatrix[mu , nu , ...]
is a product of matrices with Lorentz indices mu , nu , ...
DiracMatrix[5]
is .
DiracMatrix[6]
is .
DiracMatrix[7]
is .
The shortcut DiracMatrix
is deprecated, please use GA
instead!
[\[Mu]] DiracMatrix
This is how to enter the non-commutative product of two. The Mathematica Dot “.” is used as non-commutative multiplication operator.
[\[Mu]] . DiracMatrix[\[Nu]] DiracMatrix
[\[Alpha]] // StandardForm
DiracMatrix
(*DiracGamma[LorentzIndex[\[Alpha]]]*)
DiracMatrix
is scheduled for removal in the future versions of FeynCalc. The safe alternative is to use GA
.
[\[Mu]] GA
[\[Mu]] GAD
[GA[\[Mu]]] === DiracMatrix[\[Mu]] FCI
[GAD[\[Mu]]] === DiracMatrix[\[Mu], Dimension -> D] FCI