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dc.contributor.authorBagdonaite, Jen
dc.contributor.authorSalumbides, EJen
dc.contributor.authorPreval, SPen
dc.contributor.authorBarstow, MAen
dc.contributor.authorBarrow, Johnen
dc.contributor.authorMurphy, MTen
dc.contributor.authorUbachs, Wen
dc.date.accessioned2015-02-17T11:44:32Z
dc.date.available2015-02-17T11:44:32Z
dc.date.issued2014-09-18en
dc.identifier.citationPhysical Review Letters 113, 123002. DOI: 10.1103/PhysRevLett.113.123002en
dc.identifier.issn0031-9007
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/246818
dc.description.abstractSpectra of molecular hydrogen (H2) are employed to search for a possible proton-to-electron mass ratio (μ) dependence on gravity. The Lyman transitions of H2, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking into account the high temperature conditions (T ~ 13000 K) of their photospheres. We derive sensitivity coefficients Ki which define how the individual H2 transitions shift due to μ-dependence. The spectrum of white dwarf star GD133 yields a Δμ/μ constraint of (-2:7 ± 4:7stat ± 0:2sys) × 10-5 for a local environment of a gravitational potential φ ~ 10 4 φEarth, while that of G29-38 yields Δμ/μ = (-5:8 ± 3:8stat ± 0:3sys) × 10-5 for a potential of 2 × 10 4 φEarth.
dc.description.sponsorshipThis work was supported by the FOM-Program \Bro- ken Mirrors & Drifting Constant", Science and Technol- ogy Facilities Council, Templeton Foundation and Aus- tralian Research Council (DP110100866).
dc.languageEnglishen
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.titleLimits on a Gravitational Field Dependence of the Proton{Electron Mass Ratio from H2 in White Dwarf Starsen
dc.typeArticle
dc.description.versionThis is the accepted manuscript. The final version is available from APS at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.123002.en
prism.number123002en
prism.publicationDate2014en
prism.publicationNamePhysical Review Lettersen
prism.volume113en
dc.rioxxterms.funderSTFC
rioxxterms.versionofrecord10.1103/PhysRevLett.113.123002en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2014-09-18en
dc.contributor.orcidBarrow, John [0000-0002-6083-9751]
dc.identifier.eissn1079-7114
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/L000636/1)


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