Determination of Cosmological Constant by Statistical Lens and Effect of Inhomogeneities of the Universe on the Cosmic Age

统计透镜确定宇宙常数及宇宙不均匀性对宇宙年龄的影响

基本信息

批准号：
07640366
负责人：
FUTAMASE Toshifumi
金额：
$ 1.41万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640366/
关键词：
Gravitational Lens Giant Luminous Arc cB58 Averaging cB58 増光バイアス非一様宇宙モデル

项目摘要

Giant luminous arcs has been known as gravitational lens phenomena due to cluster of galaxies. However there is a big discrepancy between theoretical prediction of the expected number and the observed number of the arcs in a certain number of the cluster of goalaxies. We have claculated the expected number of arcs based on the recent observation of distant galaxies. The expected number we have obtained is much more than the previous estimate, but is still less than the observed one. However according our calculation we have obtained a feeling that it is not impossible to agree with the observed number if we improved mass distribution for the cluster and include the cosmological constant.We pointed out a new new lensing phenomena due to cluster of galaxy which is distored much, but is very much magnified. We show that a certain restriction on the cosmological parameters, in particular cosmological constant, is obtained using this kind of lensing. As an example of this kind of phenomena, we analyze cB58 and obtained a restriction on the cosmological constant.We have also proposed two different methods to average Einstein equation to construct locally inhomogeneous universe model. The method is applied to derive the graviational lens equation in a realistic cosmological circumstances.

巨型发光弧被称为由于星系簇而引起的重力透镜现象。但是，在一定数量的目标群中，对预期数的理论预测与观察到的弧线数之间存在很大的差异。根据最近对遥远星系的观察，我们已经隔离了弧的预期数量。我们获得的预期数量远远超过了先前的估计，但仍然小于观察到的估计数。但是，根据我们的计算，我们感觉到，如果我们改善了群集的质量分布并包括宇宙学常数，那并非不可能同意所观察到的数字。我们指出，由于星系群的群集而导致的一种新的新镜头现象，这种现象的变化很大，但很大程度上放大。我们表明，使用这种镜头获得了对宇宙学参数的一定限制，特别是宇宙学常数。作为这种现象的一个例子，我们分析了CB58并获得了宇宙常数的限制。我们还向平均爱因斯坦方程提出了两种不同的方法来构建局部局部不均匀的宇宙模型。该方法适用于在现实的宇宙学环境中得出一个性膜片方程。