Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry

Abstract

It has been pointed out in ref.[1] that in the nuMSM (Standard Model extended by three right-handed neutrinos with masses smaller than the electroweak scale), there is a corner in the parameter space where CP-violating resonant oscillations among the two heaviest right-handed neutrinos continue to operate below the freeze-out temperature of sphaleron transitions, leading to a lepton asymmetry which is considerably larger than the baryon asymmetry. Consequently, the lightest right-handed (``sterile'') neutrinos, which may serve as dark matter, are generated through an efficient resonant mechanism proposed by Shi and Fuller [2]. We re-compute the dark matter relic density and non-equilibrium momentum distribution function in this situation with quantum field theoretic methods and, confronting the results with existing astrophysical data, derive bounds on the properties of the lightest right-handed neutrinos. Our spectra can be used as an input for structure formation simulations in warm dark matter cosmologies, for a Lyman-alpha analysis of the dark matter distribution on small scales, and for studying the properties of haloes of dwarf spheroidal galaxies.

25 pages. v2: many clarifications and references added; published version

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• The Present and Future Status of Heavy Neutral Leptons
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• A Dark Matter Progenitor: Light Vector Boson Decay into (Sterile) Neutrinos
• Long-Exposure NuSTAR Constraints on Decaying Dark Matter in the Galactic Halo
• Cosmological lepton asymmetry with a nonzero mixing angle θ_{13}
• Dark Matter in the minimal Inverse Seesaw mechanism
• $N_{\mathrm{eff}}$ in low-scale seesaw models versus the lightest neutrino mass
• Searches for Long-Lived Particles at the Future FCC-ee
• Fundamental physics with the Hubble Frontier Fields: constraining Dark Matter models with the abundance of extremely faint and distant galaxies
• Possible Capture of keV Sterile Neutrino Dark Matter on Radioactive beta-decaying Nuclei
• The First Billion Years of a Warm Dark Matter Universe
• Constraining warm dark matter with cosmic shear power spectra
• An allowed window for heavy neutral leptons below the kaon mass
• Inflaton mass in the nuMSM inflation
• Sterile neutrino dark matter via GeV-scale leptogenesis?
• The spatial distribution of Milky Way satellites, gaps in streams and the nature of dark matter
• Collider signatures of sterile neutrinos in models with a gauge-singlet Higgs
• Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM
• Sterile neutrino dark matter catalyzed by a very light dark photon
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• Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures
• Strong limits on keV-scale galactic sterile neutrino dark matter with stray light from NuSTAR after 11 years of operation
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• Constraining models for keV sterile neutrinos by quasi-degenerate active neutrinos
• Exploiting flux ratio anomalies to probe warm dark matter in future large scale surveys
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• Roles of sterile neutrinos in particle physics and cosmology
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• Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the $\nu$MSM
• Sterile neutrinos in cosmology and how to find them in the lab
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• Thermal effects in freeze-in neutrino dark matter production
• Self-Interacting Dark Matter in Cosmology: accurate numerical implementation and observational constraints
• All-sky limits on Sterile Neutrino Galactic Dark Matter obtained with SRG/ART-XC after two years of operations
• Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
• Sterile neutrino rates for general $M$, $T$, $\mu$, $k$: review of a theoretical framework
• Testable dark matter solution within the seesaw mechanism
• Searching for Particle Dark Matter with eROSITA Early Data
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Dark matter search with CMB: a study of foregrounds
• Heavy Light Inflaton and Dark Matter Production
• Status and Perspectives of Neutrino Physics