Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum. (arXiv:2004.02889v1 [hep-ph])

Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum. (arXiv:2004.02889v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Blasi_S/0/1/0/all/0/1">Simone Blasi</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Brdar_V/0/1/0/all/0/1">Vedran Brdar</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Schmitz_K/0/1/0/all/0/1">Kai Schmitz</a>

The dynamical generation of right-handed-neutrino (RHN) masses in the early
Universe naturally entails the formation of cosmic strings that give rise to an
observable signal in gravitational waves (GWs). Here, we show that a
characteristic break in the GW spectrum would provide evidence for a new stage
in the cosmological expansion history and a suppression of the RHN mass scale
compared to the scale of spontaneous symmetry breaking. The detection of such a
spectral feature would thus represent a novel and unique possibility to probe
RHN masses relevant for low-scale leptogenesis.

The dynamical generation of right-handed-neutrino (RHN) masses in the early
Universe naturally entails the formation of cosmic strings that give rise to an
observable signal in gravitational waves (GWs). Here, we show that a
characteristic break in the GW spectrum would provide evidence for a new stage
in the cosmological expansion history and a suppression of the RHN mass scale
compared to the scale of spontaneous symmetry breaking. The detection of such a
spectral feature would thus represent a novel and unique possibility to probe
RHN masses relevant for low-scale leptogenesis.

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