FeynCalc manual (development version)

TC

TC[p] is the temporal component of a 4-vector and is transformed into TemporalPair[TemporalMomentum[p], ExplicitLorentzIndex[0]] by FeynCalcInternal.

See also

Overview, TemporalPair, TemporalMomentum, FCClearScalarProducts.

Examples

TC[p]

p^0

TC[p - q]

(p-q)^0

FCI[TC[p]] // StandardForm

(*TemporalPair[ExplicitLorentzIndex[0], TemporalMomentum[p]]*)

ExpandScalarProduct is used to expand momenta in TC

ExpandScalarProduct[TC[p - q]]

p^0-q^0

ExpandScalarProduct[TC[p - q]] // StandardForm

(*TemporalPair[ExplicitLorentzIndex[0], TemporalMomentum[p]] - TemporalPair[ExplicitLorentzIndex[0], TemporalMomentum[q]]*)