Gravitational lensing constraint on the cosmic equation of state

Details Gravitational lensing constraint on the cosmic equation of state Gravitational lensing constraint on the cosmic equation of state

2001-05-31

arxiv.org/abs/astro-ph/0105551v2

Int.J.Mod.Phys. D12 (2003) 953

Astronomy and Astrophysics

Astrophysics

Modified results and inclusion of calculations with new set of parameters

Scientific paper

10.1142/S0218271803003062

Recent redshift-distance measurements of Type Ia supernovae (SNe Ia) at cosmological distances suggest that two-third of the energy density of the universe is dominated by dark energy component with an effective negative pressure. This dark energy component is described by the equation of state $p_{x} = w \rho_{x}$ $(w \geq -1)$. We use gravitational lensing statistics to constrain the equation of state of this dark energy. We use $n(\Delta\theta)$, image separation distribution function of lensed quasars, as a tool to probe $w$. We find that for the observed range of $\Omega_m \sim 0.2 - 0.4$, $w$ should lie between $-0.8 \leq w \leq -0.4$ in order to have five lensed quasars in a sample of 867 optical quasars. This limit is highly sensitive to lens and Schechter parameters and evolution of galaxies.

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