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|Title: ||Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter|
|Authors: ||Kanekar, N.|
Briggs, Frank H.
|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 arXiv.org (one of the alternative locations)|
|Alternative Location: ||http://adsabs.harvard.edu/abs/2005PhRvL..95z1301K|
|Copyright: ||2005 The American Physical Society|
|Appears in Collections:||Research Papers (A&A)|
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