Dark Energy and the Statistical Study of the Observed Image Separations of the MultiplyImaged Systems in the Class Statistical Sample
Abstract
The present day observations favour a universe which is flat, accelerated and composed of ~ 1/3 matter (baryonic + dark) and ~ 2/3 of a negative pressure component, usually referred to as dark energy or quintessence. The Cosmic Lens All Sky Survey (CLASS), the largest radioselected galactic mass scale gravitational lens search project to date, has resulted in the largest sample suitable for statistical analysis. In the work presented here, we exploit observed image separations of the multiplyimaged lensed radio sources in the sample. We use two different tests: (1) image separation distribution function n(Δθ) of the lensed radio sources and (2) Δθ_{pred} versus Δθ_{obs} as observational tools to constrain the cosmological parameters w and Ω_{m}. The results are in concordance with the bounds imposed by other cosmological tests.
 Publication:

International Journal of Modern Physics D
 Pub Date:
 2004
 DOI:
 10.1142/S0218271804004979
 arXiv:
 arXiv:astroph/0307441
 Bibcode:
 2004IJMPD..13.1005D
 Keywords:

 Dark energy;
 gravitational lensing;
 CLASS sample;
 Astrophysics
 EPrint:
 20 pages latex