Nonthermal leptogenesis via cosmological gravitational particle production is tested by inflationary gravitational waves

TL;DR

This paper investigates how inflationary gravitational waves and gravitational particle production can test nonthermal leptogenesis models that link cosmic inflation with right-handed neutrinos.

Contribution

It demonstrates that inflation models testable by upcoming CMB experiments can generate right-handed neutrinos sufficient for baryogenesis, connecting gravitational waves with particle physics.

Findings

Inflation models can produce right-handed neutrinos in sufficient abundance.

Next-generation CMB experiments can test these inflation models.

Gravitational wave signatures can confirm the particle production mechanism.

Abstract

We explore the coincidence of scales between cosmic inflation and right-handed neutrinos in seesaw models. We show that inflation models, which will be tested by next-generation CMB experiments, can produce right-handed neutrinos in sufficient abundance to explain the observed baryon asymmetry of the universe. The model can be tested by gravitational wave signatures from cosmic inflation and particle production.