Do lensing statistics rule out a cosmological constant?

Masashi Chiba, Yuzuru Yoshii

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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/SO 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 Ω0 = 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 Ω0 ≃ 0.2 and Ω0 + λ0 = 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.

Original languageEnglish
Pages (from-to)485-488
Number of pages4
JournalAstrophysical Journal
Issue number2 PART I
Publication statusPublished - 1997


  • Cosmology: theory
  • Galaxies: general
  • Gravitational lensing


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