Journal
GENERAL RELATIVITY AND GRAVITATION
Volume 35, Issue 6, Pages 969-990Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1024094215852
Keywords
cosmology; Copernican principle; Einstein field equation
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We discuss inhomogeneous cosmological models which satisfy the Copernican principle. We construct some inhomogeneous cosmological models starting from the ansatz that the all the observers in the models view an isotropic cosmic microwave background. We discuss multi-fluid models, and illustrate how more general inhomogeneous models may be derived, both in General Relativity and in scalar-tensor theories of gravity. Thus we illustrate that the cosmological principle, the assumption that the Universe we live in is spatially homogeneous, does not necessarily follow from the Copernican principle and the high isotropy of the cosmic microwave background. We also present some new conformally flat two-fluid solutions of Einstein's field equations.
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