Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276....4p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 1, 1984, p. 4-12. Research supported by the Deutsche Forschungsge
Astronomy and Astrophysics
Astrophysics
33
Big Bang Cosmology, Homogeneity, Red Shift, Isotropic Media, Space-Time Functions
Scientific paper
Motivated by the desirability of direct observational verification of the large-scale homogeneity of the universe, and relying on assumptions deemed to be well supported by the existing observational data, we develop local models with radial inhomogeneities as a first step toward a detailed framework for comparison with observations. Various observational quantities are expanded in powers of the redshift. While the leading terms generally coincide with the corresponding Friedmann-Robertson-Walker quantities, the higher order contributions are modified by the presence of inhomogeneities. It is concluded that inasmuch as the next-to-leading terms (such as the deceleration parameter) in such an expansion are generally poorly determined by present observations, the inhomogeneous models developed here are locally indistinguishable from the standard homogeneous models. A possible exception may be the measurement of redshift evolution, should this become feasible with sufficient accuracy.
Mashhoon Bahram
Partovi Hossein M.
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