Hot Leptogenesis from Thermal Dark Matter

Abstract

In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are in thermal equilibrium with a dark sector with temperature higher than the Standard Model (SM) thermal bath. Specifically, we consider the scenario in which thermal Dark Matter (DM) abundance is fixed from the freeze-out of DM annihilations into RHNs. Due to the inert nature of the RHNs, we show that it is possible for the two sectors to remain thermally decoupled by having more than two generations of the RHNs. The hotter temperature implies higher abundances of DM and RHNs with the following consequences. For leptogenesis, an enhancement in efficiency up to a factor of 51.6 can be obtained, though a resonant enhancement of CP violation is still required due to an upper mass bound of about 4 TeV for the RHNs. For the DM, an enhanced annihilation cross section up to a factor of 51.6 is required to obtain the correct DM abundance. This scenario can be probed via indirect detection of DM annihilating into RHNs, which then decay into $h\nu$, $Z\nu$ and $W^{\pm }{\ell }^{\mp }$ with an enhanced annihilation cross section above the typical thermal value.

29 pages, 11 figures. V2: version published in JCAP

References in corpus (21)

• Leptogenesis
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• The Sphaleron Rate in the Minimal Standard Model
• Flavour Matters in Leptogenesis
• Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
• Thermal Dark Matter From A Highly Decoupled Sector
• Search for Neutrinos from Dark Matter Self-Annihilations in the center of the Milky Way with 3 years of IceCube/DeepCore
• WIMP and SIMP Dark Matter from the Spontaneous Breaking of a Global Group
• The Graininess of Dark Matter Haloes
• Phenomenology of ELDER Dark Matter
• A framework for testing leptonic unitarity by neutrino oscillation experiments
• The Sensitivity of HAWC to High-Mass Dark Matter Annihilations
• WIMP miracle of the second kind
• On thermal production of self-interacting dark matter
• Multipole analysis of IceCube data to search for dark matter accumulated in the Galactic halo
• Spectator Effects during Leptogenesis in the Strong Washout Regime
• Helicitogenesis: WIMPy baryogenesis with sterile neutrinos and other realizations
• A Radiative Neutrino Mass Model with SIMP Dark Matter
• CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case
• Systematic uncertainties from halo asphericity in dark matter searches

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• From WIMPs to FIMPs with Low Reheating Temperatures
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