Primordial density perturbations and reheating from gravity
Journal Article
·
· Physical Review. D, Particles Fields
- Department of Physics, University of Crete, GR-710 03 Heraklion (Greece)
We consider the presence and evolution of primordial density perturbations in a cosmological model based on a simple ansatz which captures--by providing a set of effective gravitational field equations--the strength of the enhanced quantum loop effects that can arise during inflation. After deriving the general equations that perturbations obey, we concentrate on scalar perturbations and show that their evolution is quite different than that of conventional inflationary models but still phenomenologically acceptable. The main reason for this novel evolution is the presence of an oscillating regime after the end of inflation which makes all superhorizon scalar modes oscillate. The same reason allows for a natural and very fast reheating mechanism for the Universe.
- OSTI ID:
- 21421109
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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