Neutrino dark matter and the Higgs portal : improved freeze-in analysis

Show simple item record De Romeri, Valentina Karamitros, Dimitrios Lebedev, Oleg Toma, Takashi 2020-11-23T07:47:01Z 2020-11-23T07:47:01Z 2020-10-21
dc.identifier.citation De Romeri , V , Karamitros , D , Lebedev , O & Toma , T 2020 , ' Neutrino dark matter and the Higgs portal : improved freeze-in analysis ' , Journal of High Energy Physics , vol. 2020 , no. 10 , 137 .
dc.identifier.other PURE: 150272679
dc.identifier.other PURE UUID: 07fc26c5-85c6-4621-b8ce-458a6740ae67
dc.identifier.other RIS: urn:D98CBD1EA7753350F16A9874CA0DFDF7
dc.identifier.other RIS: De Romeri2020
dc.identifier.other WOS: 000586367000001
dc.description.abstract Sterile neutrinos are one of the leading dark matter candidates. Their masses may originate from a vacuum expectation value of a scalar field. If the sterile neutrino couplings are very small and their direct coupling to the inflaton is forbidden by the lepton number symmetry, the leading dark matter production mechanism is the freeze-in scenario. We study this possibility in the neutrino mass range up to 1 GeV, taking into account relativistic production rates based on the Bose-Einstein statistics, thermal masses and phase transition effects. The specifics of the production mechanism and the dominant mode depend on the relation between the scalar and sterile neutrino masses as well as on whether or not the scalar is thermalized. We find that the observed dark matter abundance can be produced in all of the cases considered. We also revisit the freeze-in production of a Higgs portal scalar, pointing out the importance of a fusion mode, as well as the thermalization constraints. en
dc.format.extent 41
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject Beyond Standard Model
dc.subject CONSTRAINTS
dc.subject Cosmology of Theories beyond the SM
dc.subject MASSES
dc.subject PARAMETERS
dc.subject 114 Physical sciences
dc.title Neutrino dark matter and the Higgs portal : improved freeze-in analysis en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1029-8479
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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