MeV sterile neutrinos in low reheating temperature cosmological scenarios

Abstract

It is commonly assumed that the cosmological and astrophysical bounds on the mixings of sterile with active neutrinos are much more stringent than those obtained from laboratory measurements. We point out that in scenarios with a very low reheating temperature T_RH << 100 MeV at the end of (the last episode of) inflation or entropy creation, the abundance of sterile neutrinos becomes largely suppressed with respect to that obtained within the standard framework. Thus, in this case cosmological bounds become much less stringent than usually assumed, allowing sterile neutrinos to be ``visible'' in future experiments. Here, we concentrate on massive (mostly sterile) neutrinos heavier than 1 MeV.

14 pp, 7 figs

References in corpus (6)

• Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model
• The effect of a late decaying scalar on the neutralino relic density
• Testing MeV dark matter with neutrino detectors
• CRPropa: A Numerical Tool for the Propagation of UHE Cosmic Rays, Gamma-rays and Neutrinos
• Sterile neutrino production in models with low reheating temperatures
• MeV Right-handed Neutrinos and Dark Matter

Cited by in corpus (23)

• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• Sterile Neutrinos in Light of Recent Cosmological and Oscillation Data: a Multi-Flavor Scheme Approach
• The Irreducible Axion Background
• Light new physics in XENON1T
• Freeze-in Production of Sterile Neutrino Dark Matter in U(1)${}_{\mathrm{B}-\mathrm{L}}$ Model
• Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay
• A loophole to the universal photon spectrum in electromagnetic cascades: application to the "cosmological lithium problem"
• Comprehensive constraints on heavy sterile neutrinos from core-collapse supernovae
• Number-Theory Dark Matter
• 511 keV line constraints on feebly interacting particles from supernovae
• 7 keV Sterile neutrino dark matter in $U(1{)}_R-$ lepton number model
• Heavy neutral leptons and high-intensity observables
• Two sides of the same coin: sterile neutrinos and dark radiation. Status and perspectives
• Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures
• Thermal axions with multi-eV masses are possible in low-reheating scenarios
• Current constraints on cosmological scenarios with very low reheating temperatures
• Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension
• Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
• Fireball baryogenesis from early structure formation due to Yukawa forces
• Experimental signatures of non-standard pre-BBN cosmologies
• No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
• Note on Thermalization of Non-resonantly Produced Sterile Neutrinos