†On leave from the Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg.
A new constraint on cosmological variability of the proton-to-electron mass ratio
Article first published online: 19 JUN 2002
Monthly Notices of the Royal Astronomical Society
Volume 333, Issue 2, pages 373–377, June 2002
How to Cite
Levshakov, S. A., Dessauges-Zavadsky, M., D'Odorico, S. and Molaro, P. (2002), A new constraint on cosmological variability of the proton-to-electron mass ratio. Monthly Notices of the Royal Astronomical Society, 333: 373–377. doi: 10.1046/j.1365-8711.2002.05408.x
1 The present value of the proton-to-electron mass ratio is μ0=1836.1526670 (Mohr & Taylor 2000).
2 The damped Lyα systems are believed to originate in the intervening galaxies or proto-galaxies located at cosmological distances (e.g. Wolfe et al. 1995).
3 Based on the H2 laboratory wavelengths given in Abgrall & Roueff (1989).
4 The numbers shown in parenthesis are the 1σ standard deviations in the last digits after a decimal point.
- Issue published online: 19 JUN 2002
- Article first published online: 19 JUN 2002
- Accepted 2002 February 4. Received 2002 January 13; in original form 2001 June 12
- elementary particles;
- quasars: absorption lines;
- quasars: individual: Q0347–3819;
- cosmology: observations
Exotic cosmologies predict the variability of the fundamental physical constants over the cosmic time. Using the Very Large Telescope/Ultraviolet-Visual Echelle Spectrograph (VLT/UVES) high-resolution spectra of the quasar Q0347–3819 and unblended electronic-vibrational-rotational lines of the H2 molecule identified at zabs=3.025 we test possible changes in the proton-to-electron mass ratio μ0=mp/me over the period of ∼11 Gyr. We obtained a new constraint on the time-averaged variation rate of μ0 of |μ˙/μ0|<5×10-15 yr-1 (1σ confidence level). The estimated 1σ uncertainty interval of the |Δμ/μ0| ratio of about 0.004 per cent implies that since the time when the H2 spectrum was formed at zabs=3.025, μ0 has not changed by more than a few thousandths of a per cent.