Rethinking Lensing and Lambda

Abstract

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.

14 pages, 5 figures, AASTeX; accepted in ApJL

References in corpus (1)

• The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble Constant

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