All metrics have curvature tensors characterised by its invariants as a limit: the ε-property
arXiv:1107.3210 · doi:10.1088/0264-9381/28/15/157001
Abstract
We prove a generalisation of the -property, namely that for any dimension and signature, a metric which is not characterised by its polynomial scalar curvature invariants, there is a frame such that the components of the curvature tensors can be arbitrary close to a certain "background". This "background" is defined by its curvature tensors: it is characterised by its curvature tensors and has the same polynomial curvature invariants as the original metric.
6 pages