Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-08
Phys.Rev.Lett.92:121302,2004
Astronomy and Astrophysics
Astrophysics
uses revtex, 4 pages 3 figures. Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.92.121302
Most of the successful physical theories rely on the constancy of few fundamental quantities (such as the speed of light, $c$, the fine-structure constant, \alpha, the proton to electron mass ratio, \mu, etc), and constraining the possible time variations of these fundamental quantities is an important step toward a complete physical theory. Time variation of \alpha can be accurately probed using absorption lines seen in the spectra of distant quasars. Here, we present the results of a detailed many-multiplet analysis performed on a new sample of Mg II systems observed in high quality quasar spectra obtained using the Very Large Telescope. The weighted mean value of the variation in \alpha derived from our analysis over the redshift range 0.4
Aracil Bastien
Chand Hum
Petitjean Patrick
Srianand Raghunathan
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