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Title: Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter
Authors: Kanekar, N.
Carilli, C.L.
Langston, G.I.
Rocha, G.
Combes, F.
Subrahmanyan, Ravi
Stocke, J.
Menten, K.M.
Briggs, Frank H.
Wiklind, T.
Issue Date: Dec-2005
Publisher: American Physical Society
Citation: Physical Review Letters, 2005, Vol.95, p261301
Abstract: 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 [ΔF/F]=(0.44±0.36stat±1.0syst)×10-5, consistent with no evolution over the redshift range 0<z≲0.7. The measurements have a 2σ sensitivity of [Δα/α]<6.7×10-6 or [Δμ/μ]<1.4×10-5 to fractional changes in α and μ over a period of ˜6.5Gyr, half the age of the Universe. These are among the most sensitive constraints on changes in μ.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0031-9007
1079-7114 (Onnline)
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Copyright: 2005 The American Physical Society
Appears in Collections:Research Papers (A&A)

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