Explaining Accelerating Universe from Ultimate Theory

2019 Fiscal Year Final Research Report

• Project Area: Why does the Universe accelerate? - Exhaustive study and challenge for the future -
• Project/Area Number: 15H05895
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Ooguri Hirosi 東京大学, カブリ数物連携宇宙研究機構, 特任教授 (20185234)
• Co-Investigator(Kenkyū-buntansha): 早田 次郎 神戸大学, 理学研究科, 教授 (00222076) ; 野村 泰紀 東京大学, カブリ数物連携宇宙研究機構, 主任研究員 (40647616) ; 山本 一博 九州大学, 理学研究院, 教授 (50284154)
• Project Period (FY): 2015-06-29 – 2020-03-31
• Keywords: 素粒子論 / 宇宙論

Outline of Final Research Achievements

Progress has been made in the Swampland program to give constraints on low energy effective theory of consistent quantum theory of gravity such as string theory. In particular, new Swampland conditions such as "de Sitter condition" and "anti-de Sitter condition" have been proposed. These proposals have made impact on models of elementary particles and cosmology. At the same time, some of Swampland conditions have been placed on more solid foundations. In particular, a rigorous proof was given to the statement that there is no global symmetry in consistent quantum theory of gravity, using the holographic principle. This statement has been debated over 50 years, and our work finally settled the discussion. We also proposed new theoretical models of inflation and dark matter in the Universe.

Free Research Field

超弦理論

Academic Significance and Societal Importance of the Research Achievements

一般相対性理論と量子力学の統合を目指す超弦理論の完成は、自然界の最も基本的な法則を解明しようとする人類の大きな知的作業の到達目標の一つである。本研究では、特に近年発達した宇宙観測技術と協奏して宇宙のダークセクターの理解を深め、それにより超弦理論の理論的検証の可能性をひろげた。これは超弦理論の完成に向けた大きな一歩である