Wash-In Leptogenesis

Wash-In Leptogenesis

We present a leptogenesis mechanism based on the standard type-I seesaw model that successfully operates at right-handed-neutrino masses as low as a few hundred TeV. This mechanism, which we dub wash-in leptogenesis, does not require any C P violation in the neutrino sector and can be implemented ev...

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Veröffentlicht in:Physical review letters 2021-05, Vol.126 (20), p.1-201802, Article 201802
Hauptverfasser: Domcke, Valerie, Kamada, Kohei, Mukaida, Kyohei, Schmitz, Kai, Yamada, Masaki
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Cosmology
High temperature
Low temperature
Neutrinos
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container_end_page 201802
container_issue 20
container_start_page 1
container_title Physical review letters
container_volume 126
creator Domcke, Valerie
Kamada, Kohei
Mukaida, Kyohei
Schmitz, Kai
Yamada, Masaki
description We present a leptogenesis mechanism based on the standard type-I seesaw model that successfully operates at right-handed-neutrino masses as low as a few hundred TeV. This mechanism, which we dub wash-in leptogenesis, does not require any C P violation in the neutrino sector and can be implemented even in the regime of strong wash-out. The key idea behind wash-in leptogenesis is to generalize standard freeze-out leptogenesis to a nonminimal cosmological background in which the chemical potentials of all particles not in chemical equilibrium at the temperature of leptogenesis are allowed to take arbitrary values. This sets the stage for building a plethora of new baryogenesis models where chemical potentials generated at high temperatures are reprocessed to generate a nonvanishing B − L asymmetry at low temperatures. As concrete examples, we discuss wash-in leptogenesis after axion inflation and in the context of grand unification.
doi_str_mv 10.1103/PhysRevLett.126.201802
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source American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Cosmology
High temperature
Low temperature
Neutrinos
title Wash-In Leptogenesis
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