Decaying $Λ$ cosmologies and statistical properties of gravitational lenses

Details Decaying $Λ$ cosmologies and statistical properties of gravitational lenses Decaying $Λ$ cosmologies and statistical properties of gravitational lenses

1995-04-28

arxiv.org/abs/astro-ph/9504101v2

Mon.Not.Roy.Astron.Soc.279:712,1996

Astronomy and Astrophysics

Astrophysics

reformated file, 19 pages, Latex, 8 figures available on request

Scientific paper

In this paper we investigate the statistical properties of gravitational lenses for models in which a cosmological term decreases with time as $\Lambda \propto a^{-m}$, where $a$ is the scale factor and $m$ is a parameter ($0 \leq m < 3$). We show that for given low values of the present matter density parameter $\Omega_{m0}$, there is a wide range of values for $m$ for which the lensing rate is significantly smaller than that in cosmological constant ($\Lambda$) models. We also show that models with low $\Omega_{m0}$ and $m\stackrel{>}{\sim}2$ have high likelihood to reproduce the observed lens statistics in the HST snapshot survey.

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