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Title: Limits on the Dependence of the Fine-Structure Constant on Gravitational Potential from White-Dwarf Spectra
Authors: Berengut, J. C.
Flambaum, V. V.
Ong, A.
Webb, J. K.
Barrow, J. D.
Barstow, Martin A.
Preval, Simon P.
Holberg, J. B.
First Published: 3-Jul-2013
Publisher: American Physical Society
Citation: Physical Review Letters, 2013, 111 (1), 010801-1-010801-5
Abstract: We propose a new probe of the dependence of the fine-structure constant α on a strong gravitational field using metal lines in the spectra of white-dwarf stars. Comparison of laboratory spectra with far-UV astronomical spectra from the white-dwarf star G191-B2B recorded by the Hubble Space Telescope Imaging Spectrograph gives limits of Δα/α=(4.2±1.6)×10−5 and (−6.1±5.8)×10−5 from FeV and NiV spectra, respectively, at a dimensionless gravitational potential relative to Earth of Δϕ≈5×10−5. With better determinations of the laboratory wavelengths of the lines employed these results could be improved by up to 2 orders of magnitude.
DOI Link: 10.1103/PhysRevLett.111.010801
ISSN: 0031-9007
eISSN: 1079-7114
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © 2013 American Physical Society. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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