Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/11/044
Keywords
dark matter theory; leptogenesis; physics of the early universe; ultra high energy photons and neutrinos
Funding
- NExT/SEPnet Institute
- Mainz Institute for Theoretical Physics (MITP)
- STFC Consolidated [ST/L000296/1]
- Ramon y Cajal
- Spanish MINECO [FPA2014-54459-P, SEV-2014-0398]
- Generalitat Valenciana [PROMETEOII/2014/049]
- uropean Union's Horizon research and innovation programme under the Marie Sklodowska-Curie [690575, 674896]
- Portuguese FCT through the CFTP-FCT Unit 777 [PEst-OE/FIS/UI0777/2013]
- STFC [ST/L000296/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000296/1] Funding Source: researchfish
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We revisit a model in which neutrino masses and mixing are described by a two right-handed (RH) neutrino seesaw scenario, implying a strictly hierarchical light neutrino spectrum. A third decoupled RH neutrino, N-DM with mass M-DM, plays the role of cold dark matter (DM) and is produced by the mixing with a source RH neutrino, Ns with mass M-S, induced by Higgs portal interactions. The same interactions are also responsible for N-DM decays. We discuss in detail the constraints coming from DM abundance and stability conditions showing that in the hierarchical case, for M-DM >> M-S, there is an allowed window on M-DM values necessarily implying a contribution, from DM decays, to the high-energy neutrino flux recently detected by IceCube. We also show how the model can explain the matter-antimatter asymmetry of the Universe via leptogenesis in the quasi-degenerate limit. In this case, the DM mass should be within the range 300 GeV less than or similar to M-S < M-DM < 10PeV. We discuss the specific properties of this high-energy neutrino flux and show the predicted event spectrum for two exemplary cases. Although DM decays, with a relatively hard spectrum, cannot account for all the IceCube high-energy data, we illustrate how this extra source of high-energy neutrinos could reasonably explain some potential features in the observed spectrum. In this way, this represents a unified scenario for leptogenesis and DM that could be tested during the next years with more high-energy neutrino events.
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