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ID: 499552.0, MPI für Kernphysik / Theoretical Particle and Astro-Particle Physics
Large lepton asymmetry for small baryon asymmetry and warm dark matter
Authors:Gu, Pei-Hong
Language:English
Date of Publication (YYYY-MM-DD):2010-11-15
Title of Journal:Physical Review D
Journal Abbrev.:Phys Rev D
Volume:82
Issue / Number:9
Start Page:1
End Page:8
Sequence Number of Article:093009
Review Status:not specified
Audience:Experts Only
Abstract / Description:We propose a resonant leptogenesis scenario in a U(1)_{B-L} gauge extension of the standard model to generate large lepton asymmetries for cosmological baryon asymmetry and dark matter. After B-L number is spontaneously broken, inflaton can pick up a small vacuum expectation value for the mass splits of three pairs of quasi-degenerately heavy Majorana neutrinos and the masses of three sterile neutrinos. With thermal mass effects of sphaleron, the observed small baryon asymmetry can be converted from large lepton asymmetries of individual flavors although total lepton asymmetry is assumed zero. The mixing between sterile and active neutrinos is elegantly suppressed by the heavy Majorana neutrinos. Before the active neutrinos start their strong flavor conversions, the sterile neutrinos as warm dark matter can be produced by resonant active-sterile neutrino oscillations to reconcile X-ray and Lyman-\alpha bounds. Small neutrino masses are naturally realized by seesaw contributions from the heavy Majorana neutrinos and the sterile neutrinos.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
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