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Title: Limits on a gravitational field dependence of the proton-electron mass ratio from H2 in white dwarf stars.
Authors: Bagdonaite, J.
Salumbides, E. J.
Preval, S. P.
Barstow, M. A.
Barrow, J. D.
Murphy, M. T.
Ubachs, W.
First Published: 18-Sep-2014
Citation: Physical Review Letters, 2014, 113, 123002
Abstract: Spectra 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∼13 000  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±0.2syst)×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±0.3syst)×10(-5) for a potential of 2×10(4) ϕEarth.
DOI Link: 10.1103/PhysRevLett.113.123002
ISSN: 0031-9007
eISSN: 1079-7114
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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