Parametrically amplified super-radiance towards hot big bang universe
Abstract
We propose a mechanism of preheating stage after inflation, using a new idea of parametrically amplified super-radiance. Highly coherent state, characterized by macro-coherence of scalar field coupled to produced massless particle in pairs, is created by parametric resonance effects associated with field oscillation around its potential minimum, within a Hubble volume. The state is described effectively by the simple Dicke-type of super-radiance model, and super-radiant pulse is emitted within a Hubble time, justifying neglect of cosmic expansion. Produced particles are shown to interact to change their energy and momentum distribution to realize thermal hot big bang universe. A long standing problem of heating after inflation may thus be solved. A new dark matter candidate produced at the emergence of thermalized universe is suggested as well.
Keywords
Cite
@article{arxiv.2408.08605,
title = {Parametrically amplified super-radiance towards hot big bang universe},
author = {Motohiko Yoshimura and Kunio Kaneta and Kin-ya Oda},
journal= {arXiv preprint arXiv:2408.08605},
year = {2024}
}
Comments
7 pages, 2 figures, accepted form for journal publication; explanations are substantially improved from the first version