Study of fine-structure constants (Potekhin+ 1994)

Details Study of fine-structure constants (Potekhin+ 1994) Study of fine-structure constants (Potekhin+ 1994)

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ycat..41040089p&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/104/89. Originally published in: 1994A&AS..104...89P

Physics

Atomic Physics

Atomic Physics, Qsos

Scientific paper

A statistical analysis of fine splitting of C IV, N V, O VI, Mg II, Al III and Si IV doublet absorption lines in quasar spectra is carried out in order to estimate a possible time variation of the fine-structure constant α= e2(h/2π)c (~1/137) over cosmological time scales t~1010yr. The observational basis of the analysis is a catalogue of 1414 pairs of wavelengths with redshifts z = 0.2 - 3.7, compiled from data published in 1980-1992. Robust statistical estimates like the ``trimmed mean'' are used as well as the least squares. No statistically significant time variation of α is found. The estimate α-1dα/dz = (-0.6+/-2.8)10-4 is obtained. For the 95% significance level, an upper bound on the rate of a relative variation of the fine-structure constant is |α-1dα/dz| < 5.6x10-4, which corresponds approximately to |α-1dα/dt| < 4x10-14 yr-1. This limit represents the strongest up-to-date restriction on the possible time variation of α for the epoch 0.2 <= z <~ 4. (6 data files).

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