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Baryon and Lepton Number Violation from Gravitational Waves
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We describe a unique gravitational wave signature for a class of models with a vast hierarchy between the symmetry breaking scales. The unusual shape of the signal is a result of the overlapping contributions to the stochastic gravitational wave background from cosmic strings produced at a high scale and a cosmological phase transition at a low scale. We apply this idea to a simple model with gauged baryon and lepton number, in which the high-scale breaking of lepton number is motivated by the seesaw mechanism for the neutrinos, whereas the low scale of baryon number breaking is required by the observed dark matter relic density. The novel signature can be searched for in upcoming gravitational wave experiments.
Forward citations
Cited by 2 Pith papers
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Gravitational waves from seesaw assisted collapsing domain walls
Right-handed-neutrino couplings generate the energy bias that collapses Z2 domain walls, linking the type-I seesaw mass scale to observable gravitational-wave peaks and to resonant leptogenesis.
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Gravitational wave signatures of dark sector portal leptogenesis
A Z2-odd dark sector with a heavy fermion and two scalars enables TeV-scale leptogenesis and produces LISA-visible gravitational waves from a strong electroweak phase transition.
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