Rethinking Lensing and Lambda

Details Rethinking Lensing and Lambda Rethinking Lensing and Lambda

2002-06-27

arxiv.org/abs/astro-ph/0206496v1

Astrophys.J. 575 (2002) L1-L4

Astronomy and Astrophysics

Astrophysics

14 pages, 5 figures, AASTeX; accepted in ApJL

Scientific paper

10.1086/342558

Strong gravitational lensing has traditionally been one of the few phenomena said to oppose a large cosmological constant; many analyses of lens statistics have given upper limits on $\Omega_\Lambda$ that are marginally inconsistent with the concordance cosmology. Those conclusions were based on models where the predicted number counts of galaxies at moderate redshifts (z~0.5-1) increased significantly with $\Omega_\Lambda$. I argue that the models should now be calibrated by counts of distant galaxies. When this is done lens statistics lose most of their sensitivity to the cosmological constant.

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