21 Scopus citations

Abstract

We consider the implications of a shared production mechanism between the baryon asymmetry of the universe and the relic abundance of dark matter, that does not result in matching asymmetries. We present a simple model within a two sector leptogenesis framework, in which right handed sterile neutrinos decay out of equilibrium to both the standard model and the dark sector, generating an asymmetry in one and populating the other. This realization naturally accommodates light dark matter in the keV mass scale and above. Interactions in the dark sector may or may not cause the sector to thermalize, leading to interesting phenomenological implications, including hot, warm or cold thermal relic dark matter, while evading cosmological constraints. Under minimal assumptions the model provides a novel non-thermal production mechanism for sterile neutrino dark matter and predicts indirect detection signatures which may address the unexplained 3.5 keV line observed in various galaxy clusters.

Original languageEnglish
Article number015022
JournalPhysical Review D
Volume99
Issue number1
DOIs
StatePublished - 1 Jan 2019

Funding

FundersFunder number
Ambrose Monell Foundation
Marie Skłodowska-Curie
I-CORE Program of the Planning Budgeting Committee
European Research Council
Simons Foundation
Institute for Advanced Study
Horizon 2020 Framework Programme682676, 690575
United States-Israel Binational Science Foundation2016153, 1111/17
German-Israeli Foundation for Scientific Research and DevelopmentI-1283-303.7/2014
ERC-CoG-2015682676 LDMThExp
National Science FoundationPHY-1066293
Israel Science Foundation2522/17, 1937/12

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