Gravitational Lensing Statistics as a Probe of Dark Energy

Details Gravitational Lensing Statistics as a Probe of Dark Energy Gravitational Lensing Statistics as a Probe of Dark Energy

2000-10-18

arxiv.org/abs/astro-ph/0010351v1

Mod.Phys.Lett.A15:1023-1029,2000

Astronomy and Astrophysics

Astrophysics

9 pages, 2 figures

Scientific paper

10.1142/S0217732300001304

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 $\Omega_m$, the dark energy density parameter $\Omega_x$ and its equation of state $\omega_x = p_x/\rho_x$. It is shown that, the larger the dark energy density is and the more negative its pressure is, the higher the gravitational lensing probability is. This fact can provide an independent constraint for dark energy.

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