Geocentrism reexamined

Details Geocentrism reexamined Geocentrism reexamined

1995-06-09

arxiv.org/abs/astro-ph/9506068v1

Phys.Rev. D52 (1995) 1821-1827

Astronomy and Astrophysics

Astrophysics

RevTeX source, 14 pages, no figs. To appear Phys Rev D

Scientific paper

10.1103/PhysRevD.52.1821

The universe is nearly isotropic on very large scales. It is much more difficult to show that the universe is radially homogeneous (independent of distance), or equivalently, that it is isotropic about distant points. This taken as an axiom, since if it were not true, then we would occupy a preferred position. This paper considers several empirical arguments for radial homogeneity based on the cosmic microwave background (CMB). The tightest limits on inhomogeneity on the scale of the horizon are of order ten percent but will improve soon. These limits involve the Sunyaev-Zel'dovich effect in clusters of galaxies, excitation of low-energy atomic transitions, and the accurately thermal spectrum of the CMB. Weaker limits from primordial nucleosynthesis are discussed briefly.

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