Observational homogeneity of the universe

Details Observational homogeneity of the universe Observational homogeneity of the universe

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..605b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 15, 1986, p. 605-614.

Astronomy and Astrophysics

Astronomy

23

Cosmology, Homogeneity, Isotropic Media, Spatial Distribution, Universe, Anisotropic Media, Astronomical Models, Ideal Fluids, Relativity, Space-Time Functions, Thermodynamic Properties

Scientific paper

A new approach to observational homogeneity is presented. The observation that stars and galaxies in distant regions appear similar to those nearby may be taken to imply that matter has had a similar thermodynamic history in widely separated parts of the Universe (the Postulate of Uniform Thermal Histories, or PUTH). If one supposes that similar thermodynamic histories imply similar dynamical histories, then the distant apparent similarity is evidence for spatial homogeneity of the Universe. Using General Relativity to test this idea the authors take a perfect fluid model and implement PUTH by the condition that the density and entropy per baryon shall be the same function of the proper time along all galaxy world-lines. The standard models of cosmology, the Bianchi models, and the Kantowski-Sachs models all satisfy this condition, and are all spatially homogeneous. The authors now ask whether this condition ensures spatial homogeneity in general. Somewhat to their surprise, they find examples which show that it does not.

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