Cosmological isotropy
= Cosmological isotropy
<Cosmological isotropy> means that coarse-grained spatial observations or their statistics are unchanged by rotations about an observer. In an <FRW metric> it holds about every comoving location. <cosmological isotropy> about a single location is weaker than <spatial homogeneity>: a radially inhomogeneous model centred on that location can also have an isotropic sky.