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dc.contributor.authorHeikinheimo, Matti
dc.contributor.authorTenkanen, Tommi
dc.contributor.authorTuominen, Kimmo
dc.contributor.authorVaskonen, Ville
dc.date.accessioned2016-10-13T06:22:30Z
dc.date.available2016-10-13T06:22:30Z
dc.date.issued2016
dc.identifier.citationHeikinheimo, M., Tenkanen, T., Tuominen, K., & Vaskonen, V. (2016). Observational constraints on decoupled hidden sectors. <em>Physical Review D</em>, 94 (6), 063506. <a href="http://dx.doi.org/10.1103/PhysRevD.94.063506">doi:10.1103/PhysRevD.94.063506</a>
dc.identifier.otherTUTKAID_71418
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/51608
dc.description.abstractWe consider an extension of the Standard Model with a singlet sector consisting of a real (pseudo)scalar and a Dirac fermion coupled with the Standard Model only via the scalar portal. We assume that the portal coupling is weak enough for the singlet sector not to thermalize with the Standard Model allowing the production of singlet particles via the freeze-in mechanism. If the singlet sector interacts with itself sufficiently strongly, it may thermalize within itself, resulting in dark matter abundance determined by the freeze-out mechanism operating within the singlet sector. We investigate this scenario in detail. In particular, we show that requiring the absence of inflationary isocurvature fluctuations provides lower bounds on the magnitude of the dark sector self-interactions and in parts of the parameter space favors sufficiently large self-couplings, supported also by the features observed in the small-scale structure formation.
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review D
dc.subject.otherextensions of the Standard Model
dc.subject.othersinglet sector
dc.subject.othercoupling
dc.subject.otherdark matter abundance
dc.titleObservational constraints on decoupled hidden sectors
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201610104317
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2016-10-10T15:15:04Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn1550-7998
dc.relation.volume94
dc.type.versionpublishedVersion
dc.rights.copyright© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1103/PhysRevD.94.063506


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