Structure Formation due to Spatial Curvature Perturbations in the Universe

宇宙空间曲率扰动导致的结构形成

• 批准号: 04804010
• 负责人: TOMITA Kenji
• 金额: $ 0.77万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04804010/
• 关键词: Cosmology; Galaxy Formation; Gravitational Instability; 動力不安定性; 構造形成

It is one of the most important works to study the mutual relation between the theories of structure formation (for galaxies and clusters of galaxies) and the observation of anisotropy of the cosmic background radiation. After the detection of the temperature fluctuation by the COBE measurement, this study has reached the stage of new development. In the present study project I engaged in the following articles. In the 1992 fiscal year I put attention to the secondary density perturbations caused by the first-order irregular spatial curvature and analyzed their behaviors, to avoid the contradiction between the theories and observation. This result and the other studies on the temperature fluctuation showed us that this perturbations play a role in the small-scale irregularities.In the 1993 fiscal year, I studied continuously the above density perturbations and the derivation of inhomogeneous cosmological models in the Anti-Newtoninan approximation. In addition, I had the following two activities :1. Studies on the observational implications of the above density perturbations, the gravitaional lens effect associated with the large-scale clustering of high-redshift QSOs, and the masking effect and dust obscuration due to foreground galaxies for the background high-redshift QSOs.2. The Colloquium on High-Redshift Objects and Gravitational Lens Effect (held in the Uji Research Center in Yukawa Institute for Theoretical Physics, on Dec.6 - 8th, 1993). We had about 25 participants. As it was held just after the discovery of MACHO(new gravitationally lensed objects), participants were much exited and earnestly discussed. This colloquium was very significant.

研究星系和星系团的结构形成理论与宇宙背景辐射各向异性观测之间的相互关系是宇宙学的重要工作之一。在COBE测量探测到温度波动后，这一研究进入了新的发展阶段。在本研究项目中，我从事了以下几篇文章。在1992年的财政年度中，我注意到由一阶不规则空间曲率引起的二次密度扰动，并分析了它们的行为，以避免理论和观测之间的矛盾。这一结果和其他关于温度涨落的研究表明，这种微扰在小尺度不规则性中起作用。在1993财政年度，我继续研究了上述密度微扰和反牛顿南近似下非均匀宇宙学模型的推导。此外，我还进行了以下两项活动：1.研究上述密度扰动、与高红移类星体大尺度成团有关的引力透镜效应、前景星系对背景高红移类星体的遮蔽效应和尘埃遮蔽的观测意义.高红移天体与引力透镜效应学术讨论会（1993年12月6 - 8日，汤川理论物理研究所宇治研究中心）。我们有大约25名参与者。由于它是在发现新的引力透镜天体（NIO）之后举行的，与会者非常兴奋和认真地讨论。这次座谈会意义重大。

项目成果

冨田憲二: "Density Perturbations Driven by the Irregular Spatial Curvature in Inhomogeneous Cosmological Models" Astrophysical Journal. 394. 401-408 (1992)

Kenji Tomita：“非均匀宇宙学模型中不规则空间曲率驱动的密度扰动”《天体物理学杂志》394. 401-408 (1992)。

Kenji Tomita: "Homogenization of Inhomogeneous Cosmological Models" Phys.Rev.D. Vol.48, No.12. 5634-5641 (1993)

Kenji Tomita：“非均匀宇宙学模型的均质化”Phys.Rev.D。

冨田憲二: "Image Deformation due to Gravitational Lensing Associated with High-Redshift Quasar Clustering" Proceedings of 3lst Liege International Astrophysical Conference. 31. 587-592 (1993)

Kenji Tomita：“与高红移类星体聚类相关的引力透镜引起的图像变形”第三届列日国际天体物理学会议记录31. 587-592 (1993)。

Kenji Tomita, Kazuya Watanabe, and Hideyuki Tagoshi: "Masking Effect on High-Redshift QSOs due to Foreground Galaxies" Publications of Astronomical Society of Japan. Vol.45, No.4. 487-495 (1993)

Kenji Tomita、Kazuya Watanabe 和 Hideyuki Tagoshi：“前景星系对高红移 QSO 的掩蔽效应”，日本天文学会出版物。

冨田憲二: "Homogenization of Inhomogeneous Cosmological Models" Phys.Rev.D. 48. 5634-5641 (1993)

Kenji Tomita：“非均匀宇宙学模型的均质化”Phys.Rev.D 48. 5634-5641 (1993)