Leptogenesis via Bubble Collisions
Year: 2024
Type: preprint
Abstract: We present a novel realization of leptogenesis from the decays of sterile (right-handed) neutrinos (RHNs) produced from runaway bubble collisions at a first order phase transition. Such configurations can produce heavy RHNs with mass many orders of magnitude above the scale of symmetry breaking as well as the temperature of the plasma, thereby enabling high scale leptogenesis without the need for high reheat temperatures while also naturally suppressing washout effects. This mechanism also extends the window of viability to RHN masses $\gtrsim 10^{14}$ GeV, the natural scale for type-I seesaw with $\mathcal{O}(1)$ couplings, where standard thermal leptogenesis cannot produce the observed baryon asymmetry. The corresponding phase transitions are at scales $\gtrsim\!10^9$ GeV and produce gravitational wave signals that could be detected by future experiments.
Source: arXiv (Cornell University)
Authors: Cataldi, Martina, Shakya, Bibhushan
Institutions: Universität Hamburg, Deutsches Elektronen-Synchrotron DESY
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6948185200
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