| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
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 | Affiliation: | NRAO), 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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |