Do Lensing Statistics Rule Out a Cosmological Constant?

Details Do Lensing Statistics Rule Out a Cosmological Constant? Do Lensing Statistics Rule Out a Cosmological Constant?

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489..485c&link_type=abstract

Astrophysical Journal v.489, p.485

Astronomy and Astrophysics

Astronomy

25

Cosmology: Theory, Cosmology: Gravitational Lensing, Galaxies: General

Scientific paper

We present new calculations of gravitational lensing statistics in view of recent revisions in our knowledge of the luminosity function and internal velocity dispersion of E/S0 galaxies that work as effective lenses for background high-redshift QSOs. We show that the theoretical prediction of the lensing statistics is much smaller than previously expected. In sharp contrast to earlier statistics supporting an Omega 0 = 1 universe, the small lensing probability reported from the Hubble Space Telescope (HST) Snapshot Lens Survey is in best agreement with a low-density, flat universe with Omega 0 ~= 0.2 and Omega 0 + lambda 0 = 1. The age of this universe, combined with the HST measurement of a high value for the Hubble constant H0, can be reconciled with the age of the oldest globular clusters in the Milky Way.

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