Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..293c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 293-309.
Astronomy and Astrophysics
Astrophysics
32
Black Holes (Astronomy), Cosmology, Galactic Evolution, Universe, Astrophysics, Helium, Space Density
Scientific paper
The possibility is considered that black holes could form prolifically in a cold (i.e., photonless) early universe. It is argued that unless the 3-K background was generated after decoupling or during a stiff perihadron era, the only plausible way to produce that radiation would be through black-hole accretion. This scenario is shown to be feasible if the density of the black holes was at least one-tenth of the critical density. Differences between black-hole formation in a cold and a hot universe are discussed, and the formation of primordial stars from overdense regions in a cold universe is examined. A scheme of galaxy formation is outlined which involves gas collecting at the centers of bound black-hole clusters. It is noted that the model of a cold universe is unlikely to produce the observed abundance of helium.
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