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arXiv · 2601.20939

Probing Bose-enhanced Inflaton Decay with Gravitational Waves

Nicolás Bernal·Quan-feng Wu·Xun-Jie Xu·Yong Xu
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Abstract

We investigate cosmic reheating dynamics in the presence of a transient condensate formed by bosonic decay products of the inflaton. We show that the emergence of such a condensate and the corresponding Bose enhancement can dramatically increase the efficiency of inflaton decay, giving rise to qualitatively new reheating dynamics beyond the standard perturbative picture. As a consequence, graviton production from inflaton decay processes is significantly amplified by Bose enhancement effects, leading to a stochastic gravitational-wave background with a potentially observable amplitude, even in the low-frequency regime.

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Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu, Yong Xu. 2026-01-28. Probing Bose-enhanced Inflaton Decay with Gravitational Waves. https://doi.org/10.1007/jhep06(2026)197

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