Separate Universes beyond General Relativity
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DOI: 10.1103/physrevd.95.043529
Abstract: We establish purely geometric or metric-based criteria for the validity of the separate universe ansatz, under which the evolution of small-scale observables in a long-wavelength perturbation is indistinguishable from a separate Friedmann-Robertson-Walker cosmology in their… read more here.
Keywords: cosmology; separate universes; general relativity; perturbation ... See more keywords