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Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter

Kanekar, N; Carilli, C L; Langston, G I; Rocha, G; Combes, F; Subrahamanyan, R; Stocke, J T; Menten, K M; Briggs, Franklin; Wiklind, T


We have detected the four 18 cm OH lines from the z∼0.765 gravitational lens toward PMN J0134–0931. The 1612 and 1720 MHz lines are in conjugate absorption and emission, providing a laboratory to test the evolution of fundamental constants over a large lookback time. We compare the HI and OH main line absorption redshifts of the different components in the z∼0.765 absorber and the z∼0.685 lens toward B0218+357 to place stringent constraints on changes in F≡gp[α2/μ]1.57. We obtain...[Show more]

CollectionsANU Research Publications
Date published: 2005-12-19
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.95.261301


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