Chengalur, Jayaram N. ; Kanekar, Nissim (2003) Constraining the Variation of Fundamental Constants using 18 cm OH Lines Physical Review Letters, 91 (24). ISSN 0031-9007
Full text not available from this repository.
Official URL: http://doi.org/10.1103/PhysRevLett.91.241302
Related URL: http://dx.doi.org/10.1103/PhysRevLett.91.241302
Abstract
We describe a new technique to estimate variations in the fundamental constants using 18 cm OH absorption lines, with the advantage that all lines arise in the same species, allowing a clean comparison between the measured redshifts. In conjunction with one additional transition, it is possible to simultaneously measure changes in α, gp, and y≡me/mp. We use the 1665 and 1667 MHz line redshifts in conjunction with those of HI 21 cm and mm-wave molecular absorption in a gravitational lens at z∼0.68 to constrain changes in the three parameters over the redshift range 0<z≲0.68. While the constraints are relatively weak (≲1 part in 103), this is the first simultaneous constraint on the variation of all three parameters. Either one (or more) of α, gp, and y must vary with cosmological time or there must be systematic velocity offsets between the OH, HCO+, and HI bsorbing clouds.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 118125 |
Deposited On: | 14 May 2021 07:17 |
Last Modified: | 14 May 2021 07:17 |
Repository Staff Only: item control page