Mathematics – Logic
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvd..35.2955f&link_type=abstract
Physical Review D (Particles and Fields), Volume 35, Issue 10, 15 May 1987, pp.2955-2960
Mathematics
Logic
161
Particle-Theory And Field-Theory Models Of The Early Universe, Theory Of Quantized Fields
Scientific paper
Particle creation due to the changing spacetime metric at the end of an inflationary era in the early Universe is discussed. The Universe is assumed to make a transition from de Sitter space to either a radiation-dominated or matter-dominated universe. A perturbation approach is used to calculate the number density and energy density of massless, nonconformally coupled particles created by this transition. It is found that their energy density is typically of the order of ρv 2/ρPl, where ρv is the value of the cosmological constant in the de Sitter phase and ρPl is the Planck energy density. This is approximately the energy density of a thermal bath at the Gibbons-Hawking temperature of de Sitter space. The possible applications of this effect to inflationary models is discussed. It is shown that gravitational particle creation is capable of reheating the Universe after inflation and of being the source of the matter in the Universe. This effect makes it possible to avoid the difficulty with reheating which inflationary models with weakly coupled scalar fields otherwise encounter.
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