Rethinking lensing and Λ

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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 ΩΛ that are marginally inconsistent with the concordance cosmology. Those conclusions were based on models in which the predicted number counts of galaxies at moderate redshifts (z ∼ 0.5-1) increased significantly with Ω Λ. 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.

Original languageEnglish (US)
Pages (from-to)L1-L4
JournalAstrophysical Journal
Issue number1 II
StatePublished - Aug 10 2002


All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmological parameters
  • Galaxies: evolution
  • Gravitational lensing

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