Constraints on variations of mp/me based on UVES observations of H2



This article summarizes the latest results on the proton-to-electron mass ratio μ derived from H2 observations at high redshift in the light of possible variations of fundamental physical constants. The focus lies on UVES observations of the past years as enormous progress was achieved since the first positive results on Δμ /μ were published. With the better understanding of systematics, dedicated observation runs, and numerous approaches to improve wavelength calibration accuracy, all current findings are in reasonable good agreement with no variation and provide an upper limit of Δμ /μ < 1 × 10–5 for the redshift range of 2 < z < 3. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)