FeynCalc manual (development version)

FCSetMetricSignature

FCSetMetricSignature sets the signature of the Minkowski metric used when working with Cartesian objects, like CartesianPair, CartesianIndex, CartesianMomentum etc.

The default choice is $(1,-1,-1,-1)$ which corresponds to FCSetMetricSignature[{1,-1}].

See also

Overview, FCGetMetricSignature.

Examples

FCSetMetricSignature[{-1, 1}] 
 
SPD[p, q] // LorentzToCartesian

$$p\cdot q-p^0 q^0$$

FCSetMetricSignature[{1, -1}] 
 
SPD[p, q] // LorentzToCartesian

$$p^0 q^0-p\cdot q$$