Gravitational Lensing Statistics as a Probe of Dark Energy
Abstract
By using the comoving distance, we derive an analytic expression for the optical depth of gravitational lensing, which depends on the redshift to the source and the cosmological model characterized by the cosmic mass density parameter Ω_{m}, the dark energy density parameter Ω_{x} and its equation of state ω_{x}=p_{x}/ρ_{x}. It is shown that, the larger the dark energy density and the more negative its pressure, the higher is the gravitational lensing probability. This fact can provide an independent constraint for dark energy.
 Publication:

Modern Physics Letters A
 Pub Date:
 May 2000
 DOI:
 10.1142/S0217732300001304
 arXiv:
 arXiv:astroph/0010351
 Bibcode:
 2000MPLA...15.1023Z
 Keywords:

 Astrophysics
 EPrint:
 9 pages, 2 figures