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순수물리이론연구단
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Constraining FIMP from the structure formation of the Universe: analytic mapping from m(WDM)

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dc.contributor.authorAyuki Kamada-
dc.contributor.authorKeisuke Yanagi-
dc.date.available2020-03-18T08:18:54Z-
dc.date.created2020-02-17-
dc.date.issued2019-11-
dc.identifier.issn1475-7516-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/7066-
dc.description.abstractA feebly interacting massive particle (FIMP), contrasting with a weakly interacting massive particle (WIMP), is an intriguing dark matter (DM) candidate. Light (keV-scale) FIMP DM is of particular interest: its radiative decay leaves a line signal in x-ray spectra; and it is warm dark matter (WDM) and alters the galactic-scale structure formation of the Universe from that with WIMP DM. Once a possible x-ray line is reported (e.g., 3.5 keV line infers 7 keV FIMP DM), one has to check whether or not this FIMP DM is compatible with the structure formation. Here is an issue: the structure formation constraint on WDM is often reported in terms of the so-called thermal WDM mass mWDM, which cannot be directly applied to FIMP parameters. In this paper, we introduce a benchmark FIMP model that represents well a broad class of FIMP models. A big advantage of this benchmark is that we can derive the analytic formula of the non-thermal phase space distribution of FIMPs produced from freeze-in processes. By further deriving a certain "warmness" quantity, we can analytically map mWDM to FIMP parameters. Our analytic map indicates that 7 keV FIMP DM, without entropy production or a degenerate spectrum, is in tension with the latest Lyman-alpha forest data. Our analytic map will be very useful for future updates of observational constraints and reports of x-ray lines. It is also very easy to incorporate our analytic formula into a Boltzmann solver so that a linear matter power spectrum is readily accessible. Our benchmark model will facilitate FIMP searches and particle physics model-building. c. 2019 IOP Publishing Ltd and Sissa Medialab-
dc.description.uri1-
dc.language영어-
dc.publisherIOP PUBLISHING LTD-
dc.titleConstraining FIMP from the structure formation of the Universe: analytic mapping from m(WDM)-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000507259700026-
dc.identifier.scopusid2-s2.0-85080102113-
dc.identifier.rimsid71389-
dc.contributor.affiliatedAuthorAyuki Kamada-
dc.identifier.doi10.1088/1475-7516/2019/11/029-
dc.identifier.bibliographicCitationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.11, no.11, pp.029-
dc.citation.titleJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS-
dc.citation.volume11-
dc.citation.number11-
dc.citation.startPage029-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordPlusWARM DARK-MATTER-
dc.subject.keywordPlusHYDRODYNAMICAL SIMULATIONS-
dc.subject.keywordPlusDENSITY-FLUCTUATIONS-
dc.subject.keywordPlusSTERILE NEUTRINOS-
dc.subject.keywordPlusGALAXY FORMATION-
dc.subject.keywordPlusCP CONSERVATION-
dc.subject.keywordPlusEMISSION-
dc.subject.keywordPlusWDM-
dc.subject.keywordPlusREIONIZATION-
dc.subject.keywordPlusMODELS-
dc.subject.keywordAuthordark matter theory-
dc.subject.keywordAuthorLyman alpha forest-
dc.subject.keywordAuthorpower spectrum-
dc.subject.keywordAuthordark matter simulations-
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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