PREHEATING THE UNIVERSE AFTER INFLATION
Journal Title: Odessa Astronomical Publications - Year 2014, Vol 27, Issue 1
Abstract
Inflationary stage is followed by particle production in the background of an oscillating inflaton field, which process is called preheating. For sufficiently strong couplings between the inflaton and matter fields, it is known to proceed non-perturbatively, with parametric resonance playing crucial role for bosonic fields. The evolution of the occupation numbers for fermions is non-perturbative as well. In the Minkowski space, parametric resonance for bosons and non-perturbative effects for fermions would still persist even in the case of weak coupling. In particular, the energy density of created bosons would grow exponentially with time. However, the situation is quite different in the expanding universe. We give a simple demonstration how the conditions of the expanding universe, specifically, redshift of the field modes, lead to the usual perturbative expressions for particle production by an oscillating inflaton in the case of weak couplings. The results that we obtain are relevant and fully applicable to the Starobinsky inflationary model.
Authors and Affiliations
I. V. Rudenok, Yu. V. Shtanov, S. I. Vilchinskii
Keywords
Related Articles
- EP ID EP598651
- DOI -
- Views 67
- Downloads 0
THE CHEMICAL COMPOSITION OF THE ACTIVE STARS
The comparison of the results of the studies of the active stars’ chemical composition obtained by different authors has been performed. It was concluded that the difference between the abundances of some elements in act...
THREE-DIMENSIONAL NUMERICAL HYDRODYNAMICAL SIMULATION OF LOW/HARD AND HIGH/SOFT STATES IN ACCRETION DISCS OF MICROQUASARS AND QUASARS ON BASE OF UNDEFINED PRECESSION
In this study, the models of slaved precession of accretion disc and donors radiationdriven wind were performed using three-dimensional numerical astrophysical methods by the example of microquasar Cyg X-1. As is shown,...
INFLUENCE OF SPACE WEATHER EFFECTS ON THE UPPER ATMOSPHERE ACCORDING TO THE DRAG OF ARTIFICIAL EARTH SATELLITES
The applying of the method of timefrequency analysis allows to reveal the detailed structure of the manifestations of the influence of the space weather's state on the upper atmosphere of the Earth. The sensitive indicat...
GRAVITY-ANTIGRAVITY INTERPLAY ON Mpc SCALE
It is demonstrated that the major physical features of the local expansion flows of galaxies are due to antigravity domination in the dynamics of the systems.
EVALUATION OF CORONAL SHOCK WAVE VELOCITIES FROM THE II TYPE RADIO BURSTS PARAMETERS
The work presents the results of research of connection between the coronal shock waves and the parameters of type II (mII) meter-decameter bursts in 25- 180 MHz band for 66 solar proton events. The velocities of coronal...