Variability of the proton-to-electron mass ratio on cosmological scales

The search for a possible variation of fundamental physical constants is newsworthy more than ever. A multitude of methods were developed. So far the only seemingly significant detection exists for the proton-to-electron mass ratio as stated by Reinhold et al. [1]. The positive detection is based on the combined analysis of H2 absorption systems in the spectra of Q0405-443 and Q0347-383 at zabs = 2.595 and zabs = 3.025, respectively. The high resolution data of the latter is reanalyzed in this work to examine the influence of different fitting procedures and further potential nonconformities. This analysis cannot reproduce the significance achieved by the previous detection.