Light sterile neutrinos in the early universe: effects of altered dispersion relations and a coupling to axion-like dark matter

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dc.contributor.authorHellmann, Dominik
dc.contributor.authorPäs, Heinrich
dc.date.accessioned2024-07-30T09:24:26Z
dc.date.available2024-07-30T09:24:26Z
dc.date.issued2023-11-13
dc.description.abstractWe investigate the cosmological consequences of light sterile neutrinos with altered dispersion relations (ADRs) and couplings to an ultra-light, axion-like scalar field. In particular we study the impact on the number of additional, light, fermionic degrees of freedom and primordial nucleosynthesis. While the ADR leads to a new potential term in the Hamiltonian, the coupling to the scalar field results in a time dependent, effective mass contribution. We solve the quantum kinetic equations (QKEs) for the neutrino density matrix and find that in certain parameter regions both new physics effects can individually yield a suppressed population of sterile neutrino species and the correct observed amount of helium in nucleosynthesis. Combining both effects opens up new patches of parameter space excluded by experimental bounds applying to models featuring only one of the effects.en
dc.identifier.urihttp://hdl.handle.net/2003/42619
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-24455
dc.language.isoende
dc.relation.ispartofseriesJournal of cosmology and astroparticle physics;2023(11)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/de
dc.subjectneutrino propertiesen
dc.subjectcosmology of theories beyond the SMen
dc.subjectbig bang nucleosynthesisen
dc.subjectcosmological parameters from CMBRen
dc.subject.ddc530
dc.titleLight sterile neutrinos in the early universe: effects of altered dispersion relations and a coupling to axion-like dark matteren
dc.typeTextde
dc.type.publicationtypeArticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationDominik Hellmann and Heinrich Päs JCAP11(2023)056en
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1088/1475-7516/2023/11/056de

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