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

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dc.creatorKanekar, N.
dc.creatorCarilli, C. L.
dc.creatorLangston, G. I.
dc.creatorRocha, G.
dc.creatorCombes, F.
dc.creatorSubrahmanyan, R.
dc.creatorStocke, J. T.
dc.creatorMenten, K. M.
dc.creatorBriggs, F. H.
dc.creatorWiklind, T.
dc.date2005-10-27
dc.date2006-01-08
dc.date.accessioned2026-07-07T11:57:17Z
dc.date.available2026-07-07T11:57:17Z
dc.descriptionWe 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 $F \equiv g_p [α^2/μ]^{1.57}$. We obtain $[ΔF/F] = (0.44 \pm 0.36^{\rm stat} \pm 1.0^{\rm syst}) \times 10^{-5}$, consistent with no evolution over the redshift range $0 < z < 0.7$. The measurements have a $2 σ$ sensitivity of $[Δα/α] < 6.7 \times 10^{-6}$ or $[Δμ/μ] < 1.4 \times 10^{-5}$ to fractional changes in $α$ and $μ$ 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 $μ$.
dc.description4 pages, 3 figures. Final version, with minor changes to match the version in print in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/astro-ph/0510760
dc.identifierhttp://arxiv.org/abs/astro-ph/0510760
dc.identifierPhys.Rev.Lett.95:261301,2005
dc.identifierdoi:10.1103/PhysRevLett.95.261301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205826
dc.subjectAstrophysics
dc.titleConstraints on changes in fundamental constants from a cosmologically distant OH absorber/emitter
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