Towards Understanding Gravity Based on Analysis of Various Relativistic Gravitational Phenomena

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K03857
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Waseda University
• Principal Investigator: MAEDA Kei-ichi 早稲田大学, 理工学術院, 名誉教授 (70199610)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 一般相対性理論 / 重力波 / 階層的三体系 / ブラックホール / ダークエネルギー / 修正重力理論 / 時空特異点

Outline of Final Research Achievements

With the success of Big Bang cosmology and the discovery of gravitational waves, general relativity is increasingly considered a correct relativistic theory of gravity. On the other hand, the existence of singularities in the early universe and within black holes necessitates its modification. Additionally, in order to solve the dark energy problem, which is the greatest mystery of modern cosmology, research on modified theories of gravity has become active. In this study, we tackled the elucidation of the nature of gravity by analyzing various relativistic gravitational phenomena. In particular, we discovered two new observable phenomena in the dynamics of hierarchical triple systems and their gravitational waves, and also showed that minimal modified gravity theory could provide an explanation for the dark energy problem.

Free Research Field

理論宇宙物理学

Academic Significance and Societal Importance of the Research Achievements

重力研究の進展は新しい物理学誕生につながる可能性を秘めており，ダークエネルギー等の現代宇宙論の最大の謎の解明への第一歩となる研究は学術的に大きな意義がある。