Cosmological parameters and gravitational lensing statistics

Phillip Helbig

in Proceedings of the Seventeenth Texas Symposium on Relativistic Astrophysics and Cosmology (ADS: 1995NYASA.759.....B)
H. Böhringer, G. E. Morfill & J. E. Trümper (eds.)
Annals of the New York Academy of Sciences 759, 600–603 (1995)
ISBN 0-89766941-X (cloth)
ISBN 0-89766942-8 (paper)

Lensing statistics gives a method of testing the cosmological constant at intermediate redshifts---at low and high redshifts the possibilities for measuring $\lambda_{0}$ are limited and even at intermediate redshifts $\lambda_{0}$ often cancels out in observable relations---using well-understood lens theory and standard astrophysical assumptions