Abstract
We study a scenario in which the baryon asymmetry of the universe arises from a cosmological phase transition where lepton-number is spontaneously broken. If the phase transition is first order, a lepton-number asymmetry can arise at the bubble wall, through dynamics similar to electroweak baryogenesis, but involving right-handed neutrinos. In addition to the usual neutrinoless double beta decay in nuclear experiments, the model may be probed through a variety of “baryogenesis by-products”, which include a stochastic background of gravitational waves created by the colliding bubbles. Depending on the model, other aspects may include a network of topological defects that produce their own gravitational waves, additional contribution to dark radiation, and a light pseudo-Goldstone boson (majoron) as dark matter candidate.
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Long, A.J., Tesi, A. & Wang, LT. Baryogenesis at a lepton-number-breaking phase transition. J. High Energ. Phys. 2017, 95 (2017). https://doi.org/10.1007/JHEP10(2017)095
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DOI: https://doi.org/10.1007/JHEP10(2017)095