Sterile neutrino dark matter via GeV-scale leptogenesis?

Abstract

It has been proposed that in a part of the parameter space of the Standard Model completed by three generations of keV...GeV right-handed neutrinos, neutrino masses, dark matter, and baryon asymmetry can be accounted for simultaneously. Here we numerically solve the evolution equations describing the cosmology of this scenario in a 1+2 flavour situation at temperatures $T\le 5$ GeV, taking as initial conditions maximal lepton asymmetries produced dynamically at higher temperatures, and accounting for late entropy and lepton asymmetry production as the heavy flavours fall out of equilibrium and decay. For 7 keV dark matter mass and other parameters tuned favourably, $\sim 10\%$ of the observed abundance can be generated. Possibilities for increasing the abundance are enumerated.

20 pages

References in corpus (5)

• The nuMSM, leptonic asymmetries, and properties of singlet fermions
• Opening a new window for warm dark matter
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• On the hadronic contribution to sterile neutrino production
• $N_{\mathrm{eff}}$ in low-scale seesaw models versus the lightest neutrino mass

Cited by in corpus (13)

• The Present and Future Status of Heavy Neutral Leptons
• On the origin of matter in the Universe
• Kinetic equations for sterile neutrinos from thermal fluctuations
• HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis
• A thermal neutrino interaction rate at NLO
• New Physics Search at the CEPC: a General Perspective
• Efficient numerical integration of thermal interaction rates
• Inverse Seesaw, dark matter and the Hubble tension
• Minimal Leptogenesis in Brane-inspired Cosmology
• Neutrino masses and gravitational wave background
• Sterile neutrino rates for general $M$, $T$, $\mu$, $k$: review of a theoretical framework
• Testable dark matter solution within the seesaw mechanism
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations