Constraint on a Varying Proton-Electron Mass Ratio 1.5 Billion Years after the Big Bang

J. Bagdonaite, W.M.G. Ubachs, M.T. Murphy, J.B. Withmore

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10% of the age of the Universe today, is analyzed to put a constraint on a varying proton-electron mass ratio, μ. A high resolution spectrum of the J1443+2724 quasar, which was observed with the Very Large Telescope, is used to create an accurate model of 89 Lyman and Werner band transitions whose relative frequencies are sensitive to μ, yielding a limit on the relative deviation from the current laboratory value of Δμ/μ=(-9.5±5.4stat±5.3syst)×10-6.
Original languageEnglish
Article number071301
Pages (from-to)071301
JournalPhysical Review Letters
Volume114
Issue number7
DOIs
Publication statusPublished - 2015

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