DiracSigmaExplicit
DiracSigmaExplicit[exp]
inserts in exp for all DiracSigma
its definition. DiracSigmaExplict
is also an option of DiracSimplify
. DiracSigmaExplict
is also an option of various FeynCalc functions that handle the Dirac algebra.
See also
Overview, DiracGamma, DiracSigma.
Examples
DiracSigma[GA[\[Alpha]], GA[\[Beta]]]
DiracSigmaExplicit[%]
σαβ
21i(γˉα.γˉβ−γˉβ.γˉα)
GSD[p] . DiracSigma[GAD[\[Mu]], GAD[\[Nu]]] . GSD[q]
DiracSigmaExplicit[%]
(γ⋅p).σμν.(γ⋅q)
21i((γ⋅p).γμ.γν.(γ⋅q)−(γ⋅p).γν.γμ.(γ⋅q))