SPD[a, b]
denotes a -dimensional scalar product.
SPD[a, b]
is transformed into ScalarProduct[a, b,Dimension->D]
by FeynCalcInternal
.
SPD[p]
is the same as SPD[p,p]
.
Overview, PD, Calc, ExpandScalarProduct, ScalarProduct.
[p, q] + SPD[q] SPD
[p - q, q + 2 p] SPD
[ SPD[p - q, q + 2 p] ] Calc
[SPD[p - q]] ExpandScalarProduct
[a, b] // StandardForm
SPD
(*SPD[a, b]*)
[a, b] // FCI // StandardForm
SPD
(*Pair[Momentum[a, D], Momentum[b, D]]*)
[a, b] // FCI // FCE // StandardForm
SPD
(*SPD[a, b]*)
[ChangeDimension[SP[p, q], D]] // StandardForm
FCE
(*SPD[p, q]*)