Sterile neutrino dark matter: Impact of active-neutrino opacities

Abstract

The resonant production of keV sterile-neutrino dark matter mainly takes place during the QCD epoch of the early universe. It has been argued that it could be strongly affected by the opacities (or damping rates) of active neutrinos, which receive non-perturbative QCD-contributions. We find that for lepton asymmetries $n_{L_{\alpha }}/s$ below $10^{-6}$ the opacities significantly affect the sterile-neutrino yield, but that for larger asymmetries, which are necessary for producing a significant fraction of the dark matter, the yield is insensitive to changes of the opacities. Thus non-perturbative QCD contributions to the opacities at temperatures around 160 MeV will not affect this dark matter scenario. We obtain larger sterile-neutrino yields than previous studies, and thus weaker lower limits on the active-sterile mixing angle from Big Bang Nucleosynthesis.

arXiv comment18 pages, ancillary data files added

References in corpus (33)

• Sterile Neutrinos as Dark Matter
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• The $\nu$MSM, Dark Matter and Neutrino Masses
• A New Dark Matter Candidate: Non-thermal Sterile Neutrinos
• Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters
• An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster
• The role of sterile neutrinos in cosmology and astrophysics
• Sterile Neutrino Hot, Warm, and Cold Dark Matter
• Lyman-alpha constraints on warm and on warm-plus-cold dark matter models
• Sterile Neutrino Dark Matter
• Fluctuations of conserved charges at finite temperature from lattice QCD
• Quark mass thresholds in QCD thermodynamics
• Fluctuations and Correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model
• Can sterile neutrinos be the dark matter?
• Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray Observations
• Lightest sterile neutrino abundance within the nuMSM
• A lower bound on the mass of Dark Matter particles
• Sterile neutrino dark matter bounds from galaxies of the Local Group
• The nuMSM, leptonic asymmetries, and properties of singlet fermions
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• (Almost) Closing the $\nu$MSM Sterile Neutrino Dark Matter Window with NuSTAR
• On the hadronic contribution to sterile neutrino production
• Lepton asymmetry and primordial nucleosynthesis in the era of precision cosmology
• Sterile neutrino dark matter: A tale of weak interactions in the strong coupling epoch
• Dodelson-Widrow Mechanism In the Presence of Self-Interacting Neutrinos
• Astrophysical constraints on resonantly produced sterile neutrino dark matter
• NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact
• Improved determination of sterile neutrino dark matter spectrum
• Closing in on Resonantly Produced Sterile Neutrino Dark Matter
• Precision study of GeV-scale resonant leptogenesis
• Sterile neutrino dark matter via GeV-scale leptogenesis?
• Kinetic equations for sterile neutrinos from thermal fluctuations

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• Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the $\nu$MSM
• Axion-Sterile-Neutrino Dark Matter
• 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
• Opening up New Parameter Space for Sterile Neutrino Dark Matter