Probing Right Handed Neutrino assisted Reheating with Gravitational Waves and Leptogenesis
Arghyajit Datta, Shaaban Khalil, Rajat Kumar Mandal, Arunansu Sil

TL;DR
This paper explores a non-instantaneous reheating scenario where inflaton decay to right-handed neutrinos drives leptogenesis and generates gravitational waves, which could be detected by future experiments, linking early Universe dynamics with observable signals.
Contribution
It introduces a unified model connecting non-instantaneous reheating, leptogenesis, and gravitational wave production within a right-handed neutrino framework.
Findings
GW spectrum within proposed experimental sensitivity
Reheating dynamics influence GW production mechanisms
Leptogenesis successfully explains baryon asymmetry
Abstract
We investigate a non-instantaneous reheating period in the early Universe, where the inflaton field decays exclusively to right-handed neutrinos (RHNs). The subsequent decay of these RHNs into Standard Model particles not only drives the transition to a radiation-dominated era but also generates the baryon asymmetry of the Universe via leptogenesis. In this typical reheating scenario, gravitational waves (GWs) can be produced during inflaton decay, both through bremsstrahlung and inflaton scattering processes. While GW production via bremsstrahlung dominates near the end of the reheating phase, inflaton scattering leads to a non-negligible GW contribution near the maximum temperature of the Universe. The combined GW spectrum from both decay and scattering processes lies within the sensitivity range of proposed resonant cavity experiments. This framework thus offers a compelling and…
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Astrophysics and Cosmic Phenomena · Neutrino Physics Research
