A New Gravitational Lens Phenomena by Cluster of Galaxies and the Measurement of Cosmological Constant

星系团的新引力透镜现象及宇宙常数的测量

• 批准号: 09640332
• 负责人: FUTAMASE Toshifumi
• 金额: $ 1.92万
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640332/
• 关键词: Gravitational lens; Cosmological constant; Magnification bias; Cluster of galaxies; Einstein ring; Hubble parameter; ウィークシェア; ダークマター; 巨大アーク像; アーク統計; 非一様時空; 平均化

This study investigates methods to determine the cosmological parameters, particularly cosmological constant using gravitational lensing. The following are results of the study.1. The distribution of angular separation between images of lensed quasar can be used to put the upper bound for the cosmological constant. We examined the magnification bias which plays an important role in this study and obtained more accurate estimation for this. Our result shows that the existence of the cosmological constant cannot be denied by the presently available observations.2. The number of giant luminous arcs in clusters of galaxies is unexpectedly large. We examined this problem and found that the presence of the cosmological constant increase the expected number of arcs.3. We showed that the observation of Einstein rings using large telescope such as SUBARU may impose a severe constraint on the cosmological constant.4. We studied the method to estimate the mass distribution of cluster of galaxies using weak shear field created by coherent distortion of background galaxies and applied the method to Q0957+561 and PG1115+080 to obtain the constraint on the Hubble parameter.

本研究探讨了利用引力透镜确定宇宙学参数，特别是宇宙学常数的方法。以下是研究结果。1.透镜类星体像之间的角间距分布可以用来确定宇宙常数的上限。我们检查了放大偏倚，这在这项研究中起着重要的作用，并获得了更准确的估计。我们的结果表明，宇宙学常数的存在不能被现有的观测所否定.星系团中巨大的发光弧的数量出乎意料地多。我们研究了这个问题，发现宇宙常数的存在增加了预期的弧数。我们表明，用SUBARU等大型望远镜观测爱因斯坦环，可能会对宇宙学常数产生严格的约束.研究了利用背景星系相干畸变产生的弱剪切场估算星系团质量分布的方法，并将该方法应用于Q0957+561和PG 1115 +080，得到了对哈勃参数的约束。

项目成果

T.Hamana,T.Futamase: "Constraint on the Cosmological Constant by Einstein Ring System 0047-2508"Progress of Theoretical Physics. 102. 1037-1040 (1998)

T.Hamana，T.Futamase：“爱因斯坦环系对宇宙常数的约束0047-2508”理论物理进展。

T.Morishima,T.Futamase: "Collapsing open isotropic universe generated by nonminimally coupled scalar field"Physics Letter. B447. 46-51 (1999)

T.Morishima、T.Futamase：“由非最小耦合标量场生成的坍缩开放各向同性宇宙”《物理学快报》。

M.Takada,T.Futamase: "A Post-Neutonian Lagraneian Perturbation Approach to the large-scale structure"Monthly Notices of Royal Astronomical Society. 300. 64-78 (1999)

M.Takada，T.Futamase：“大尺度结构的后中子拉格莱尼微扰方法”皇家天文学会月刊。

T.Hamana,K.Futamase,T.Futamase: "Comments on the amplifications bras in lens statistics"Monthly Notices of Royal Astronomical Society. 287. 341-350 (1997)

T.Hamana，K.Futamase，T.Futamase：“关于镜头统计中放大胸罩的评论”皇家天文学会月刊。

H.Asada,T.Futamase: "Post-Newtonian approximation, Its foundation and application"Progress of Theoretical Physics,Supplement. 125. 123-145 (1998)

H.Asada，T.Futamase：“后牛顿近似、其基础与应用”，理论物理进展，增刊。