Graviton bremsstrahlung from right-handed neutrino decays during leptogenesis yields a gravitational wave spectrum with peak frequency inversely proportional to the Yukawa coupling and amplitude proportional to the neutrino mass squared.
Sato,First-order phase transition of a vacuum and the expansion of the Universe, Mon
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Observing Leptogenesis in Action with Gravitational Waves
Graviton bremsstrahlung from right-handed neutrino decays during leptogenesis yields a gravitational wave spectrum with peak frequency inversely proportional to the Yukawa coupling and amplitude proportional to the neutrino mass squared.