Cosmological Parameter Survey Using the Gravitational Lensing Method

Premana W Premadi , Hugo Martel , Richard Matzner , Toshifumi Futamase, PASA, 18 (2), in press.
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Contents Page: Volume 18, Number 2

Cosmological Parameter Survey Using the Gravitational Lensing Method

Premana W Premadi 1
Hugo Martel 2
Richard Matzner 3
Toshifumi Futamase 4

1 Dept. Astronomy and Bosscha Observatory, Institut Teknologi Bandung, Indonesia
premadi@as.itb.ac.id

2 Department of Astronomy, University of Texas, Austin, USA
hugo@simplicio.as.utexas.edu

3 Center for Relativity, Department of Physics, University of Texas, Austin, USA
richard@ricci.ph.utexas.edu

4 Astronomical Institute, Tohoku University, Sendai, Japan
tof@astr.tohoku.ac.jp

Abstract:

Using a multiple-lens plane algorithm, we study light propagation in inhomogeneous universes for 43 different COBE-normalized Cold Dark Matter models, with various values of the density parameter $\Omega _0$, cosmological constant $\lambda _0$, Hubble constant H0, and rms density fluctuation $\sigma _8$. We performed a total of 3,798 experiments, each experiment consisting of propagating a square beam of angular size

$21.9''\times21.9''$ composed of 116,281 light rays from the observer up to redshift z=3. These experiments provide statistics of the magnification, shear, and multiple imaging of distant sources. The results of these experiments might be compared with observations, and eventually help constrain the possible values of the cosmological parameters. Additionally, they provide insight into the gravitational lensing process and its complex relationship with the various cosmological parameters.

Keywords: cosmology: large-scale structure - gravitational lensing




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