IDEAL characterization of isometry classes of FLRW and inflationary spacetimes
IDEAL characterization of isometry classes of FLRW and inflationary spacetimes
In general relativity, an IDEAL (Intrinsic, Deductive, Explicit, ALgorithmic) characterization of a reference spacetime metric g0 consists of a set of tensorial equations T[g] = 0, constructed covariantly out of the metric g, its Riemann curvature and their derivatives, that are satisfied if and only if g is locally isometric …