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29 March 2024
 
  » arxiv » astro-ph/0510760

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Constraints on changes in fundamental constants from a cosmologically distant OH absorber/emitter
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 ;
Date 27 Oct 2005
AffiliationNRAO), C. L. Carilli (NRAO), G. I. Langston (NRAO), G. Rocha (Cambridge), F. Combes (Observatoire de Paris - LERMA), R. Subrahmanyan (ATNF), J. T. Stocke (University of Colorado), K. M. Menten (MPIfR), F. H. Briggs (ATNF/ANU), T. Wiklind (STScI/Onsala
AbstractWe have detected the four 18cm OH lines from the $z sim 0.765$ 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 $z sim 0.765$ absorber and the $z sim 0.685$ lens toward B0218+357 to place stringent constraints on changes in $F equiv g_p [alpha^2/mu]^{1.57}$. We obtain $[Delta F/F] = (0.44 pm 0.36^{ m stat} pm 1.0^{ m syst}) imes 10^{-5}$, consistent with no changes in these constants over the redshift range $0 < z < 0.7$. The measurements have a $2 sigma$ sensitivity of $[Delta alpha/alpha] < 6.7 imes 10^{-6}$ and $[Delta mu/mu] < 1.4 imes 10^{-5}$ to fractional changes in $alpha$ and $mu$, over a period of $sim 6.5$ Gyr, half the age of the Universe. These are among the most sensitive current constraints on changes in $mu$.
Source arXiv, astro-ph/0510760
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