PhysRevLett.113.123002.pdf (286.01 kB)
Limits on a gravitational field dependence of the proton-electron mass ratio from H2 in white dwarf stars.
journal contributionposted on 2017-01-09, 12:23 authored by J. Bagdonaite, E. J. Salumbides, S. P. Preval, M. A. Barstow, J. D. Barrow, M. T. Murphy, W. Ubachs
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.
This work was supported by the FOM-Program “Broken Mirrors & Drifting Constants,” Science and Technology Facilities Council, the Templeton Foundation, and the Australian Research Council (DP110100866).
CitationPhysical Review Letters, 2014, 113, 123002
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy
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