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Kanekar N, Carilli CL, Langston GI, et al. Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter. Phys Rev Lett. 2005;95(26):261301doi: 10.1103/PhysRevLett.95.261301.
Kanekar, N., Carilli, C. L., Langston, G. I., Rocha, G., Combes, F., Subrahmanyan, R., Stocke, J. T., Menten, K. M., Briggs, F. H., & Wiklind, T. (2005). Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter. Physical review letters, 95(26), 261301. https://doi.org/10.1103/PhysRevLett.95.261301
Kanekar, N, et al. "Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter." Physical review letters vol. 95,26 (2005): 261301. doi: https://doi.org/10.1103/PhysRevLett.95.261301
Kanekar N, Carilli CL, Langston GI, Rocha G, Combes F, Subrahmanyan R, Stocke JT, Menten KM, Briggs FH, Wiklind T. Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter. Phys Rev Lett. 2005 Dec 31;95(26):261301. doi: 10.1103/PhysRevLett.95.261301. Epub 2005 Dec 19. PMID: 16486334.
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Phys Rev Lett. 2005 Dec 31;95(26):261301. doi: 10.1103/PhysRevLett.95.261301. Epub 2005 Dec 19.

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

Physical review letters

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

Affiliations

  1. National Radio Astronomy Observatory, Socorro, New Mexico 87801, USA. [email protected]

PMID: 16486334 DOI: 10.1103/PhysRevLett.95.261301

Abstract

We have detected the four 18 cm OH lines from the z approximaetely 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 approximately 0.765 absorber and the z approximately 0.685 lens toward B0218 + 357 to place stringent constraints on changes in F triple-bond g(p)[alpha(2)/mu](1.57). We obtain [DeltaF/F] = (0.44 +/- 0.36(stat) +/- 1.0(sys)t) x 10(-5), consistent with no evolution over the redshift range 0 < z < or = 0.7. The measurements have a 2sigma sensitivity of [Deltaalpha/alpha] < 6.7 x 10(-6) or [Deltamu/mu] < 1.4 x 10(-5) to fractional changes in alpha and mu over a period of approximately 6.5 G yr, half the age of the Universe. These are among the most sensitive constraints on changes in mu.

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