Inhomogeneous cosmologies, the Copernican principle and the cosmic microwave background: More on the EGS theorem

Details Inhomogeneous cosmologies, the Copernican principle and the cosmic microwave background: More on the EGS theorem Inhomogeneous cosmologies, the Copernican principle and the cosmic microwave background: More on the EGS theorem

2003-02-17

arxiv.org/abs/gr-qc/0302068v1

Gen.Rel.Grav. 35 (2003) 969-990

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages; to appear in GRG

Scientific paper

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.

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