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Bremsstrahlung High-frequency Gravitational Wave Signatures of High-scale Non-thermal Leptogenesis
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abstract
Inflaton seeds non-thermal leptogenesis by pair producing right-handed neutrinos in the seesaw model. We show that the inevitable graviton bremsstrahlung associated with inflaton decay can be a unique probe of non-thermal leptogenesis. The emitted gravitons contribute to a high-frequency stochastic gravitational waves background with a characteristic fall-off below the peak frequency. Besides leading to a lower bound on the frequency ($f\gtrsim 10^{11}$ Hz), the seesaw-perturbativity condition makes the mechanism sensitive to the lightest neutrino mass. For an inflaton mass close to the Planck scale, the gravitational waves contribute to sizeable dark radiation, which is within the projected sensitivity limits of future experiments such as CMB-S4 and CMB-HD.
Forward citations
Cited by 3 Pith papers
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Seesaw Cosmology
In seesaw reheating, the post-inflation universe can pass through four alternating matter/radiation eras, with the Standard Model temperature falling as a^{-1/4} and then a^{-3/8}, which changes dark-matter production.
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Leptogenesis with sub-electroweak-scale reheating temperature
Leptogenesis remains viable for reheating temperatures below sphaleron freeze-out in three perturbative monomial-inflaton scenarios, with blue-tilted primordial GWs as a potential probe.
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Optical gravitational waves as signals of Gravitationally-Decaying Particles
A particle that decays only through gravitational channels can produce relic gravitational waves with a narrow optical-frequency spectrum, possibly at an observable abundance near the BBN/CMB bound.
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