The 'fitting problem' in cosmology

Details The 'fitting problem' in cosmology The 'fitting problem' in cosmology

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cqgra...4.1697e&link_type=abstract

Classical and Quantum Gravity (ISSN 0264-9381), vol. 4, Nov. 1, 1987, p. 1697-1729. SERC-supported research.

Astronomy and Astrophysics

Astronomy

101

Astronomical Models, Cosmology, Space-Time Functions, Universe, Conformal Mapping, Coordinates, Data Smoothing, Mass Distribution

Scientific paper

This paper considers the best way to fit an idealized exactly homogeneous and isotropic universe model to a realistic ('lumpy') universe; whether made explicit or not, some such approach of necessity underlies the use of the standard Robertson-Walker models as models of the real universe. Approaches based on averaging, normal coordinates and null data are presented, the latter offering the best opportunity to relate the fitting procedure to data obtainable by astronomical observations.

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