Momentum[p]
is the head of a four momentum p
.
The internal representation of a -dimensional is Momentum[p]
.
For other than dimensions: Momentum[p, dim]
.
Momentum[p, 4]
simplifies to Momentum[p]
.
Overview, DiracGamma, Eps, LorentzIndex, MomentumExpand.
This is a -dimensional momentum.
[p] Momentum
As an optional second argument the dimension must be specified if it is different from .
[p, D] Momentum
The dimension index is suppressed in the output.
[p, d] Momentum
[-q] Momentum
[-q] // StandardForm
Momentum
(*-Momentum[q]*)
= Momentum[p - q] + Momentum[2 q] ex
// StandardForm
ex
(*Momentum[p - q] + 2 Momentum[q]*)
// MomentumExpand // StandardForm
ex
(*Momentum[p] + Momentum[q]*)
// MomentumCombine // StandardForm
ex
(*Momentum[p + q]*)
[Momentum[p], d] // StandardForm
ChangeDimension
(*Momentum[p, d]*)