Study of the equation of state for dark energy and distribution of dark matter by gravitational lensing

利用引力透镜研究暗能量状态方程和暗物质分布

基本信息

批准号：
15540248
负责人：
FUTAMASE Toshifumi
金额：
$ 1.98万
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：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540248/
关键词：
gravitational lens cold dark matter Subaru Telescope Clusters of galaxies density profile backreaction on cosmic expansion 弱い重力レンズ暗黒物質ハッブル宇宙望遠鏡構造形成残り重力レンズミンコスフキー汎関数 X線観測

项目摘要

After the precise determination of the cosmological parameters by the observation of Cosmic Microwave Background Radiation, the understanding structure formation of the universe is one of the unsolved and important problem in cosmology. It is well known that dark matter plays a decisive role in this formation and gravitational lens is the only method to observe directly the dark matter. Thus the observation of gravitational lens is very important. In this point of view we performed the observational studies of various gravitational lens phenomena and obtained the following results.1.We performed weak lens analysis of the date from the observations of a distant cluster of galaxies using the Prime forcus came of Subaru Telescope. The cluster is regarded to be at the forming stage. According to our analysis, the distribution of dark matter is well correlated with the distribution of galaxies. This result support the prediction of Cold Dark Matter (CDM) Structure formation scenario.2.We ha … More ve performed strong lens analysis based on Hubble space telescope (HST) and weak lens analysis based on Subaru telescope for a nearby cluster of galaxies A 1689, and determined a precise mass distribution. This gives us a precise determination of the mass of the cluster and density profile. The global shape of the obtained profile coincides with the prediction of the CDM scenario, but we found that the concentration of the density in the central region is much larger than the prediction. We have proposed more observation of cluster of galaxies to HST and Subaru, and accepted partially.3.We have discovered a new cluster of galaxies by weak lens analysis in the region of a distant cluster of galaxies. This indicates the power of the lens analysis to discover cluster of galaxies.4.We have studied the back reaction of an inhomogeneous distribution of matter on the expansion of the universe and found that the effect behaves like the positive spatial curvature and does not change to the acceleration of the expansion. Less

通过宇宙微波背景辐射的观测精确确定宇宙学参数后，认识宇宙结构的形成是宇宙学中尚未解决的重要问题之一，众所周知，暗物质在宇宙结构的形成和形成中起着决定性的作用。引力透镜是直接观测暗物质的唯一方法，因此引力透镜的观测非常重要，我们对各种引力透镜现象进行了观测研究，得到了以下结论。结果：1.我们利用斯巴鲁望远镜的主焦点对一个遥远的星系团进行了弱透镜分析，根据我们的分析，该星系团处于形成阶段。物质与星系的分布有很好的相关性，这一结果支持了冷暗物质（CDM）结构形成情景的预测。2.我们已经进行了基于哈勃太空望远镜（HST）的强透镜分析和基于弱透镜分析。斯巴鲁上望远镜观察了附近的星系团 A 1689，并确定了精确的质量分布，这使我们能够精确确定星系团的质量和密度剖面。所获得的剖面的整体形状与 CDM 场景的预测相符。我们发现中心区域的密度比预测的要大得多，我们对HST和Subaru提出了更多的星系团观测，并部分接受。3.我们利用弱透镜发现了一个新的星系团。分析于这表明了透镜分析发现星系团的能力。4.我们研究了物质不均匀分布对宇宙膨胀的反作用，发现其效应如下：正空间曲率并且不改变膨胀的加速度。

项目成果

期刊论文数量（56）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Panoramic Views of Cluster-Scale Assembly Explored by Subaru Wide-Field Imaging

斯巴鲁广域成像探索集群规模装配的全景

DOI：
发表时间：
2005
期刊：
Publication of Astronomical Society in Japan, 57
影响因子：
0
作者：
T.Broadhurs;M.Takada;K.Umetsu;X.Kong;N.Arimoto;M.Chiba;T.Futamase;K.Kodama et al.(including T.Futamase)
通讯作者：
K.Kodama et al.(including T.Futamase)

Toward a No-go Theorem for a Accelarating Universe by Nonlinear Backreaction

非线性反作用加速宇宙的不可行定理