Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cqgra...7.2073m&link_type=abstract
Classical and Quantum Gravity (ISSN 0264-9381), vol. 7, Nov. 1990, p. 2073-2080.
Astronomy and Astrophysics
Astronomy
1
Chaos, Cosmology, Space-Time Functions, Astronomical Models, Hubble Constant, Radiation, Universe
Scientific paper
The effects of Hawking radiation on the evolution of the universe are examined in the context of the chaotic inflationary models. Since inflation will not end if Hawking radiation dominates the energy density, a constraint can be derived which relates the density of massless states to the Hubble parameter during the inflationary period. The form of this constraint shows that particle theories having larger values of the density of states near the Planck mass are more vulnerable to the inflationary flatness problem. A model of Hawking radiation in an expanding universe is constructed which shows that despite the domination of the passive gravitational mass by the Hawking radiation, the gauge-invariant amplitude of the metric perturbations is not significantly decreased by its presence. Some of the issues arising from the necessity of a pre-inflationary radiation-dominated phase are discussed.
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