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Prog. Theor. Phys. Supplement No.133 (1999) pp. 85-113
Various Approaches to Cosmological Gravitational Lensing in Inhomogeneous Models
Kenji Tomita,1,*
Premana Premadi2,** and
Takahiro T. Nakamura3,***
1Yukawa Institute for Theoretical Physics, Kyoto University,
Kyoto 606-8502, Japan
2 Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
3 Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
(Received February 10, 1999)
Abstract:
Gravitational lensing of distant objects caused by gravitational
tidal forces from inhomogeneities in the universe is weak in most
cases, but it is noticed that it gives a great deal of information
about the universe, especially regarding the distribution of dark
matter. The statistical values of optical quantities such as
convergence, amplification and shear have been derived by
many people using various approaches, which include the linear
perturbational treatment in the weak limit and the nonlinear treatment
considering small-scale matter distribution.
In this review paper we compare the following three main approaches:
(a) the approach in the multi-lens-plane theory; (b) the approach due
to the direct integration method; and (c) the perturbational
approach.
In the former two approaches inhomogeneous matter distributions
are produced in the CDM model using N-body simulations (the P3M
code and the tree-code, respectively). In (c) the power spectrum
corresponding to the CDM model is used for the large-scale matter
distribution.
URL :
http://ptp.ipap.jp/link?PTPS/133/85/
DOI : 10.1143/PTPS.133.85
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