FeynCalc manual (development version)

FV

FV[p, mu] is the 4-dimensional vector p^{\mu }.

See also

Overview, FCE, FCI, FVD, Pair.

Examples

FV[p, \[Mu]]

\overline{p}^{\mu }

FV[p - q, \[Mu]]

\left(\overline{p}-\overline{q}\right)^{\mu }

FV[p, \[Mu]] // StandardForm

(*FV[p, \[Mu]]*)

FCI[FV[p, \[Mu]]] // StandardForm

(*Pair[LorentzIndex[\[Mu]], Momentum[p]]*)

ExpandScalarProduct is used to expand momenta in FV

ExpandScalarProduct[FV[p - q, \[Mu]]]

\overline{p}^{\mu }-\overline{q}^{\mu }