Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385....1s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 1-8. Research supported by Canadian Institute for Ad
Astronomy and Astrophysics
Astrophysics
58
Background Radiation, Big Bang Cosmology, Dark Matter, Gravitational Effects, Microwaves, Relic Radiation, Astronomical Models, Einstein Equations, Expansion, Universe
Scientific paper
An expanding Friedmann cosmology that undergoes a recent phase of very slow expansion, or 'loitering', is examined. This scenario leads to an old universe in which large-amplitude inhomogeneities grow while producing little anisotropy in the microwave background radiation. Before loitering, the universe is expected to have gone through the usual radiation-dominated and matter-dominated phases. The loitering phase comes after this standard Einstein-de Sitter phase. It is proposed that the universe in its present state is in a late inflationary phase. It is shown that in such a cosmology the age of the universe can be significantly larger than H0 exp -1, thus eliminating any problem with globular cluster ages. Also, density inhomogeneities grow in such a way as to produce smaller microwave anisotropies in comparison with the present level of inhomogeneity.
Feldman Hume
Sahni Varun
Stebbins Albert
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