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dc.contributor.authorNurmi, Sami
dc.contributor.authorSchiappacasse, Enrico D.
dc.contributor.authorYanagida, Tsutomu T.
dc.date.accessioned2021-10-26T07:56:31Z
dc.date.available2021-10-26T07:56:31Z
dc.date.issued2021
dc.identifier.citationNurmi, S., Schiappacasse, E. D., & Yanagida, T. T. (2021). Radio signatures from encounters between neutron stars and QCD-axion minihalos around primordial black holes. <i>Journal of Cosmology and Astroparticle Physics</i>, <i>2021</i>(9), Article 004. <a href="https://doi.org/10.1088/1475-7516/2021/09/004" target="_blank">https://doi.org/10.1088/1475-7516/2021/09/004</a>
dc.identifier.otherCONVID_101599127
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/78326
dc.description.abstractProbing the QCD axion dark matter (DM) hypothesis is extremely challenging as the axion interacts very weakly with Standard Model particles. We propose a new avenue to test the QCD axion DM via transient radio signatures coming from encounters between neutron stars (NSs) and axion minihalos around primordial black holes (PBHs). We consider a general QCD axion scenario in which the PQ symmetry breaking occurs before (or during) inflation coexisting with a small fraction of DM in the form of PBHs. The PBHs will unavoidably acquire around them axion minihalos with the typical length scale of parsecs. The axion density in the minihalos may be much higher than the local DM density, and the presence of these compact objects in the Milky Way today provides a novel chance for testing the axion DM hypothesis. We study the evolution of the minihalo mass distribution in the Galaxy accounting for tidal forces and estimate the encounter rate between NSs and the dressed PBHs. We find that the encounters give rise to transient line-like emission of radio frequency photons produced by the resonant axion-photon conversion in the NS magnetosphere and the characteristic signal could be detectable with the sensitivity of current and prospective radio telescopes. It would be important to investigate in detail search strategies for such signals which would provide a novel pathway for QCD axion detection.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherIOP Publishing
dc.relation.ispartofseriesJournal of Cosmology and Astroparticle Physics
dc.rightsIn Copyright
dc.titleRadio signatures from encounters between neutron stars and QCD-axion minihalos around primordial black holes
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202110265356
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn1475-7516
dc.relation.numberinseries9
dc.relation.volume2021
dc.type.versionacceptedVersion
dc.rights.copyright© 2021 IOP Publishing Ltd and Sissa Medialab
dc.rights.accesslevelopenAccessfi
dc.subject.ysokosmologia
dc.subject.ysoneutronitähdet
dc.subject.ysopimeä aine
dc.subject.ysomustat aukot
dc.subject.ysoradioaallot
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p7160
jyx.subject.urihttp://www.yso.fi/onto/yso/p10870
jyx.subject.urihttp://www.yso.fi/onto/yso/p14101
jyx.subject.urihttp://www.yso.fi/onto/yso/p18360
jyx.subject.urihttp://www.yso.fi/onto/yso/p5743
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.rights.accessrights
dc.relation.doi10.1088/1475-7516/2021/09/004


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