A new constraint on cosmological variability of the proton-to-electron mass ratio

Details A new constraint on cosmological variability of the proton-to-electron mass ratio A new constraint on cosmological variability of the proton-to-electron mass ratio

2001-06-12

arxiv.org/abs/astro-ph/0106194v2

Mon.Not.Roy.Astron.Soc. 333 (2002) 373

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, a revised version accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05408.x

Exotic cosmologies predict variability of the fundamental physical constants over the cosmic time. Using the VLT/UVES high resolution spectra of the quasar Q0347-3819 and unblended electronic - vibrational - rotational lines of the H2 molecule identified at z = 3.025 we test possible changes in the proton - to - electron mass ratio mu_0 = m_p/m_e over the period of 11 Gyr. We obtained a new constraint on the time - averaged variation rate of mu_0 of |d mu /d t /mu_0| < 5 10^{-15} yr^{-1} (1 sigma c.l.). The estimated 1 sigma uncertainty interval of the |Delta mu/mu_0| ratio of about 0.004% implies that since the time when the H2 spectrum was formed at z = 3.025, mu_0 has not changed by more than a few thousands of a percent.

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