CSPE[p, q]
is the -dimensional scalar product of p
with q
and is transformed into CartesianPair[CartesianMomentum[p, D-4],CartesianMomentum[q, D-4]]
by FeynCalcInternal
.
CSPE[p]
is the same as CSPE[p,p]
( ).
Overview, SPE, ScalarProduct, CartesianScalarProduct.
[p, q] + CSPE[q] CSPE
[p - q, q + 2 p] CSPE
[ CSPE[p - q, q + 2 p] ] Calc
[CSPE[p - q]] ExpandScalarProduct
[a, b] // StandardForm
CSPE
(*CSPE[a, b]*)
[a, b] // FCI // StandardForm
CSPE
(*CartesianPair[CartesianMomentum[a, -4 + D], CartesianMomentum[b, -4 + D]]*)
[a, b] // FCI // FCE // StandardForm
CSPE
(*CSPE[a, b]*)
[ChangeDimension[CSP[p, q], D - 4]] // StandardForm
FCE
(*CSPE[p, q]*)