Averaging Einstein's Equations over a Hierarchy of Bound and Unbound Fragments

Details Averaging Einstein's Equations over a Hierarchy of Bound and Unbound Fragments Averaging Einstein's Equations over a Hierarchy of Bound and Unbound Fragments

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...453..574z&link_type=abstract

Astrophysical Journal v.453, p.574

Astronomy and Astrophysics

Astronomy

5

Cosmology: Theory, Relativity

Scientific paper

The different conceptual approaches to smoothing and fitting problems for an inhomogeneous universe are clarified. We carry out averaging procedures for two separate cases: a hierarchy of linear perturbations within perturbations, and a system of bound objects within a larger expanding system. It is shown that the time dependence of the average scale factor is necessarily different from that of the ideal fluid scale factor. The implications for observational estimation of H0 are discussed briefly.

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