Constraining the time variation of the fine structure constant

Details Constraining the time variation of the fine structure constant Constraining the time variation of the fine structure constant

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004msngr.116...25s&link_type=abstract

The Messenger (ISSN0722-6691), No.116, p. 25-28 (June 2004)

Physics

1

Scientific paper

The variation of several fundamental constants in physics can be probed by measuring wavelengths of atomic transitions in the high redshift Universe. In particular any possible variation in the electromagnetic fine-structure constant (α = e²/ℏc) can be detected in the absorption spectra of distant quasars. Using a well defined sample of absorption line systems we derive a 3σ upper limit on the time variation of α of -2.5 × 10-16 yr-1 ≤ (Δα / α Δt) ≤ +1.2 × 10-16 yr-1.

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