xTras Package SymbolTutorials »|See Also »|More About »

ToBackground

ToBackground[expr]
sends unperturbed (curvature) tensors to background values.
  • ToBackground does not touch tensors inside Perturbation heads.
  • The following options can be given:
BackgroundSolution{}a list of replacement rules that send curvature tensors to their background values
ExtraRules{}a list of replacement rules for other tensors