Constraints on cosmological parameters from the analysis of the Cosmic Lens All sky Survey radio - selected gravitational lens statistics

Chae, K.-H.; Biggs, A.D.; Blandford, R.D.; Browne, I.W.A.; de Bruyn, A.G.; Fassnacht, C.D.; Helbig, P.; Jackson, N.J.; King, L.J.; Koopmans, L.V.E.

doi:10.1103/PhysRevLett.89.151301

Constraints on cosmological parameters from the analysis of the Cosmic Lens All sky Survey radio - selected gravitational lens statistics

Sep, 2002

Published in:

Phys.Rev.Lett. 89 (2002) 151301

e-Print:

astro-ph/0209602 [astro-ph]

DOI:

10.1103/PhysRevLett.89.151301

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Abstract: (arXiv)

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 (CLASS) data. For a flat universe with a classical cosmological constant, we find that the present matter fraction of the critical density is

\Omega_{\rm m}=0.31^{+0.27}_{-0.14}

(68%)

^{+0.12}_{-0.10}

(systematic). For a flat universe with a constant equation of state for dark energy

w = p_x({pressure})/\rho_x({energy density})

, we find

w < -0.55^{+0.18}_{-0.11}

(68%).

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