HD as a Probe for Detecting Mass Variation on a Cosmological Time Scale

T. I. Ivanov, M. Roudjane, M. O. Vieitez, C. A. de Lange, W.-Ü L. Tchang-Brillet, W. Ubachs
2008 Physical Review Letters  
The strong electronic absorption systems of the B 1 u ÿ X 1 g Lyman and the C 1 u ÿ X 1 g Werner bands can be used to probe possible mass-variation effects on a cosmological time scale from spectra observed at high redshift, not only in H 2 but also in the second most abundant hydrogen isotopomer HD. High resolution laboratory determination of the most prominent HD lines at extreme ultraviolet wavelengths is performed at an accuracy of = 5 10 ÿ8 , forming a database for comparison with
more » ... rison with astrophysical data. Sensitivity coefficients K i d ln i =d ln are determined for HD from quantum ab initio calculations as a function of the proton-electron mass ratio . Strategies to deduce possible effects beyond first-order baryon/lepton mass ratio deviations are discussed.
doi:10.1103/physrevlett.100.093007 pmid:18352708 fatcat:5xxb76ae4bbmff6lghrgu2lvhy