Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443....1s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 1, p. 1-5
Astronomy and Astrophysics
Astrophysics
74
Background Radiation, Cosmology, Homogeneity, Isotropy, Isotropy, Microwaves, Theorem Proving, Universe, Astronomical Models, Expansion, Space-Time Functions
Scientific paper
We show that if all fundamental observers measure the cosmic microwave background radiation to be almost isotropic in an expanding universe region, then that universe is locally almost spatially homogeneous and isotropic in that region. This shows the stability of the important exact result of this type of previously proved by Ehlers, Geren, & Sachs (EGS) and formalizes the way in which almost-isentropy of the background radiation gives evidence that the universe is almost a Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime. This is the needed foundation for all recent analyses, based on the Sachs-Wolfe effect, of how background radiation anisotropies relate to growing density inhomogeneities in an almost-FLRW expanding universe.
Ellis George F. R.
Maartens Roy
Stoeger William R.
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