Research for relativistic inhomogeneous universe

2017 Fiscal Year Final Research Report

• Project/Area Number: 25400265
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka City University
• Principal Investigator: Nakao Ken-ichi 大阪市立大学, 大学院理学研究科, 教授 (90263061)
• Research Collaborator: YOO Chul-Moon ; NISHIKAWA Ryusuke
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 一般相対性理論 / 宇宙論 / 非一様宇宙 / ダークエネルギー / 構造形成 / ブラックホール

Outline of Final Research Achievements

The standard model of the modern physical cosmology is based on the working assumption called the Copernican principle which states that we are not located at the privileged position of the universe. In order to strengthen the basis of the modern physical cosmology, it is very important to observationally confirm whether this working assumption is good. However, it is, in practice, impossible to directly check whether non-Copernican inhomogeneities, i.e., inhomogeneities isotropic with respect to our location do or do not exist. It is not so easy to confirm it even indirectly. Through this research project, the effects of non-Copernican density perturbations on the growth rate of Copernican density perturbations to form clusters of galaxies and the anisotropies of the cosmic microwave background radiation have been revealed, and then it has been shown that we can put the upper bound on the non-Copernican inhomogeneities through those effects.

Free Research Field

重力理論