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dc.contributor.authorIsern, J.
dc.contributor.authorCatalan, Silvia
dc.contributor.authorGarcia-Berro, E.
dc.contributor.authorTorres, S.
dc.date.accessioned2011-12-20T11:01:11Z
dc.date.available2011-12-20T11:01:11Z
dc.date.issued2009
dc.identifier.citationIsern , J , Catalan , S , Garcia-Berro , E & Torres , S 2009 , ' Axions and the white dwarf luminosity function ' , Journal of Physics: Conference Series , vol. 172 , no. 1 , 012005 , pp. - . https://doi.org/10.1088/1742-6596/172/1/012005
dc.identifier.issn1742-6596
dc.identifier.otherPURE: 504119
dc.identifier.otherPURE UUID: 9434a096-9e83-44c3-a65e-8a8033722308
dc.identifier.otherWOS: 000273522500005
dc.identifier.otherScopus: 68349123824
dc.identifier.urihttp://hdl.handle.net/2299/7398
dc.description.abstractThe evolution of white dwarfs can be described as a simple cooling process. Recently, it has been possible to determine with an unprecedented precision their luminosity function, that is, the number of stars per unit volume and luminosity interval. Since the shape of the bright branch of this function is only sensitive to the average cooling rate, we use this property to check the possible existence of axions, a proposed but not yet detected weakly interacting particle. We show here that the inclusion of the axion emissivity in the evolutionary models of white dwarfs noticeably improves the agreement between the theoretical calculations and the observational white dwarf luminosity function, thus providing the first positive indication that axions could exist. Our results indicate that the best fit is obtained for m(a)cos(2) beta similar or equal to 2 - 6 meV, where m. is the mass of the axion and cos(2)beta is a free parameter, and that values larger than 10 meV are clearly excluded.en
dc.format.extent8
dc.language.isoeng
dc.relation.ispartofJournal of Physics: Conference Series
dc.subjectCP CONSERVATION
dc.subjectGALACTIC DISK
dc.subjectDENSE STARS
dc.subjectAGE
dc.subjectMASS
dc.subjectBREMSSTRAHLUNG
dc.subjectINVARIANCE
dc.subjectG117-B15A
dc.subjectUNIVERSE
dc.subjectLIMITS
dc.titleAxions and the white dwarf luminosity functionen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1088/1742-6596/172/1/012005
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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