Constraints on Cosmological Parameters from the Analysis of the Cosmic Lens All Sky Survey Radio-Selected Gravitational Lens Statistics

K.-H. Chae, A. D. Biggs, R. D. Blandford, I. W. A. Browne, A. G. de Bruyn, C. D. Fassnacht, Phillip Helbig, N. Jackson, L. J. King, L. V. E. Koopmans, S. Mao, D. R. Marlow, J. P. McKean, S. T. Myers, M. Norbury, T. J. Pearson, P. M. Phillips, A. C. S. Readhead, D. Rusin, C. M. Sykes, P. N. Wilkinson, E. Xanthopoulos & T. York

PRL, 89, 15, 151301 (October 2002)

We derive constraints on cosmological parameters and the properties of the lensing galaxies from gravitational lens statistics based on the final Cosmic Lens All Sky Survey data. For a flat universe with a classical cosmological constant, we find that the present matter fraction of the critical density is [Omega]m=0.31-0.14(sup +0.27) (68%)-0.10(sup +0.12) (syst). For a flat universe with a constant equation of state for dark energy w=px)(pressure/[rho]x(energy density), we find w<-0.55-0.11(sup +0.18) (68%).