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arXiv · 2408.08605

Parametrically amplified super-radiance towards hot big bang universe

Motohiko Yoshimura·Kunio Kaneta·Kin-ya Oda
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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.

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Motohiko Yoshimura, Kunio Kaneta, Kin-ya Oda. 2024-08-16. Parametrically amplified super-radiance towards hot big bang universe. https://doi.org/10.1016/j.physletb.2024.139133

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