Work

Particle decay as asymptotic narrow parametric resonance

Year: 2025

Type: article

Abstract: Parametric resonance can produce particles from an oscillating scalar field, where an exponential growth of the particle number density can be developed. While it has been noticed that stimulated decay in Boltzmann equations exhibits similar parametric dependence of the exponential growth, it is not yet quantitatively clear under what circumstances the two phenomena can reconcile. We demonstrate that trilinear particle interaction in the Boltzmann equation can provide a good approximation to describe the distribution function and the number density in the asymptotic regime of narrow parametric resonance. We find that the crucial treatment leading to the quantitative agreement is a proper Gaussian simulation of the momentum spread inherited from nonrelativistic particle decay. With the simple particle picture, the analytic Boltzmann approximation can be applied to explosive photon production from axions/axionlike particles and to dark matter production from oscillating fields.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/6849-rxjs

Author: Shao-Ping Li

Institution: The University of Osaka

Language: English

Topic: Dark Matter and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: Japan Society for the Promotion of Science

Award: Creating the Baryon Asymmetry in the Universe via Dark Matter