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Reinhold E, Buning R, Hollenstein U, et al. Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra. Phys Rev Lett. 2006;96(15):151101doi: 10.1103/PhysRevLett.96.151101.
Reinhold, E., Buning, R., Hollenstein, U., Ivanchik, A., Petitjean, P., & Ubachs, W. (2006). Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra. Physical review letters, 96(15), 151101. https://doi.org/10.1103/PhysRevLett.96.151101
Reinhold, E, et al. "Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra." Physical review letters vol. 96,15 (2006): 151101. doi: https://doi.org/10.1103/PhysRevLett.96.151101
Reinhold E, Buning R, Hollenstein U, Ivanchik A, Petitjean P, Ubachs W. Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra. Phys Rev Lett. 2006 Apr 21;96(15):151101. doi: 10.1103/PhysRevLett.96.151101. Epub 2006 Apr 17. PMID: 16712142.
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Phys Rev Lett. 2006 Apr 21;96(15):151101. doi: 10.1103/PhysRevLett.96.151101. Epub 2006 Apr 17.

Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra.

Physical review letters

E Reinhold, R Buning, U Hollenstein, A Ivanchik, P Petitjean, W Ubachs

Affiliations

  1. Laser Centre, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

PMID: 16712142 DOI: 10.1103/PhysRevLett.96.151101

Abstract

Based on highly accurate laboratory measurements of Lyman bands of H2 and an updated representation of the structure of the ground X 1sigma(g)+ and excited B 1sigma(u)+ and C 1pi(u) states, a new set of sensitivity coefficients K(i) is derived for all lines in the H2 spectrum, representing the dependence of their transition wavelengths on a possible variation of the proton-electron mass ratio mu = m(p)/m(e). Included are local perturbation effects between B and C levels and adiabatic corrections. The new wavelengths and K(i) factors are used to compare with a recent set of highly accurate H2 spectral lines observed in the Q 0347-383 and Q 0405-443 quasars, yielding a fractional change in the mass ratio of deltamu/mu = (2.4 +/- 0.6) x 10(-5) for a weighted fit and deltamu/mu = (2.0 +/- 0.6) x 10(-5) for an unweighted fit. This result indicates, at a 3.5sigma confidence level, that mu could have decreased in the past 12 Gyr.

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