Leptogenesis triggered by a first-order phase transition. (arXiv:2206.04691v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Huang_P/0/1/0/all/0/1">Peisi Huang</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Xie_K/0/1/0/all/0/1">Ke-Pan Xie</a>
We propose a new scenario of leptogenesis, which is triggered by a
first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are
massless in the old vacuum, while they acquire a mass in the new vacuum
bubbles, and the mass gap is huge compared with the FOPT temperature. The
ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs
experience fast decay and generate the lepton asymmetry, which is further
converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out
of equilibrium inside the bubble, the generated BAU does not suffer from the
thermal bath washout. We first discuss the general feature of such a FOPT
leptogenesis mechanism, and then realize it in an extended $B-L$ model. The
gravitational waves from $U(1)_{B-L}$ breaking could be detected at the future
interferometers.
We propose a new scenario of leptogenesis, which is triggered by a
first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are
massless in the old vacuum, while they acquire a mass in the new vacuum
bubbles, and the mass gap is huge compared with the FOPT temperature. The
ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs
experience fast decay and generate the lepton asymmetry, which is further
converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out
of equilibrium inside the bubble, the generated BAU does not suffer from the
thermal bath washout. We first discuss the general feature of such a FOPT
leptogenesis mechanism, and then realize it in an extended $B-L$ model. The
gravitational waves from $U(1)_{B-L}$ breaking could be detected at the future
interferometers.
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