Effect of shear on the cosmological distance and image amplification: Power spectrum approach

被引：13

作者：

Nakamura, TT

机构：

[1] Department of Physics, School of Science, University of Tokyo, Tokyo 113, 7-3-1 Hongo, Bunkyo-ku

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1997年 / 49卷 / 02期

关键词：

cosmology; dark matter; gravitational lenses; relativity;

D O I：

10.1093/pasj/49.2.151

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The effect of shear on the cosmological distance and image amplification in an inhomogeneous universe is investigated by solving the optical scalar equation perturbatively. We estimate the statistical properties of these quantities in cold dark-matter models for general cosmological parameters. We show that the effect of shear can be safely neglected for a light ray passing through a linear density inhomogeneity, which justifies the approximation used in previous studies. We also obtain an analytic expression for the skewness of the probability distribution of amplification in the Einstein-de Sitter universe.

引用

页码：151 / 157

页数：7

共 39 条

[1] GRAVITATIONAL LENSING BY SMOOTH INHOMOGENEITIES IN THE UNIVERSE [J].