Constraints on a quintessence model from gravitational lensing statistics
Abstract
Constraints on an exact quintessence scalar-field model with an exponential potential are derived from gravitational lens statistics. An exponential potential can account for data from both optical quasar surveys and radio-selected sources. Based on the Cosmic Lens All-Sky Survey (CLASS) sample, lensing statistics provides, for the pressureless matter density parameter, an estimate of ΩM0= 0.31+0.12-0.14.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 2005
- DOI:
- 10.1111/j.1365-2966.2004.08507.x
- arXiv:
- arXiv:astro-ph/0410441
- Bibcode:
- 2005MNRAS.356..937S
- Keywords:
-
- gravitational lensing;
- quasars: general;
- cosmological parameters;
- cosmology: theory;
- dark matter;
- Astrophysics
- E-Print:
- 8 pages, 6 figures