Search for cosmological μ-variation from high-redshift H2 absorption; a status report

Wim Ubachs, J. Bagdonaite, Michael T. Murphy, Ruth Buning, Lex Kaper

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review


Observations of H2 spectra in the line-of-sight of distant quasars may reveal a variation of the proton-electron mass ratio μ =m p/me at high redshift, typically for z > 2. Currently four high-quality systems (Q0347-383, Q0405-443, Q0528-250 and J2123-050) have been analyzed returning a constraint Δμ/μ< 1×10 -5. We present data and a μ-variation analysis of another system, Q2348- 011 at redshift zabs D 2.42, delivering Δμ/μ=(-1. 5±1.6) ×10-5. In addition to observational data the status of the laboratory measurements is reviewed. The future possibilities of deriving a competitive constraint on Δμ/μ from the known high-redshiftH2 absorbers is investigated, resulting in the identification of a number of potentially useful systems for detecting μ-variation.

Original languageEnglish
Title of host publicationFrom Varying Couplings to Fundamental Physics - Proceedings of Symposium 1 of JENAM 2010
PublisherKluwer Academic Publishers.
Number of pages13
ISBN (Print)9783642193965
Publication statusPublished - 2011
Event1st JENAM Symposium: From Varying Couplings to Fundamental Physics, JENAM 2010 - Lisbon, Portugal
Duration: 6 Sep 20107 Sep 2010


Conference1st JENAM Symposium: From Varying Couplings to Fundamental Physics, JENAM 2010

Fingerprint Dive into the research topics of 'Search for cosmological μ-variation from high-redshift H<sub>2</sub> absorption; a status report'. Together they form a unique fingerprint.

Cite this