The Dyer-Roeder distance-redshift relation in inhomogeneous universes

被引：14
|
作者：
Mörtsell, E [1 ]
机构：
[1] Univ Stockholm, Dept Phys, S-10691 Stockholm, Sweden
来源：
ASTRONOMY & ASTROPHYSICS | 2002年 / 382卷 / 03期
关键词：
cosmology : theory; gravitational lensing;
D O I：
10.1051/0004-6361:20011653
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using Monte-Carlo methods, we determine the best-fit value of the homogeneity parameter alpha in the Dyer-Roeder distance-redshift relation for a variety of redshifts, inhomogeneity models and cosmological parameter values. The relation between alpha and the fraction of compact objects, f(p), is found to be approximately linear. This relation can be parametrized with reasonable accuracy for all cases treated in this paper by 1 - alpha = a . fp; where a approximate to 0.6.
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收藏
页码：787 / 791
页数：5
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