Freeze-in Leptogenesis via Dark-Matter Oscillations

We study the cosmology and phenomenology of freeze-in baryogenesis via dark-matter oscillations, taking the dark matter to couple to Standard Model leptons. We investigate viable models both with and without a \(Z_2\) symmetry under which all new fields are charged. Lepton flavor effects are importa...

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Bibliographic Details
Published in:arXiv.org 2022-02
Main Authors: Berman, Justin, Shuve, Brian, Tucker-Smith, David
Format: Article
Language:English
Subjects:
Astronomical models
Asymmetry
Baryons
Cosmology
Dark matter
Electroweak model
Flavor (particle physics)
Leptons
Neutrinos
Oscillations
Phenomenology
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Summary:We study the cosmology and phenomenology of freeze-in baryogenesis via dark-matter oscillations, taking the dark matter to couple to Standard Model leptons. We investigate viable models both with and without a \(Z_2\) symmetry under which all new fields are charged. Lepton flavor effects are important for leptogenesis in these models, and we identify scenarios in which the baryon asymmetry is parametrically distinct from and enhanced relative to leptogenesis from sterile neutrino oscillations. The models we study predict the existence of new, electroweak-charged fields, and can be tested by a combination of collider searches, structure-formation studies, X-ray observations, and terrestrial low-energy tests.
ISSN:2331-8422
DOI:10.48550/arxiv.2201.11502