2022 Fiscal Year Final Research Report

Exploration of Symmetry and Cosmology with Neutrinos

Planned Research

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Project Area	Exploration of Particle Physics and Cosmology with Neutrinos
Project/Area Number	18H05542
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	Ibe Masahiro 東京大学, 宇宙線研究所, 准教授 (50599008)
Co-Investigator(Kenkyū-buntansha)	渡利泰山東京大学, カブリ数物連携宇宙研究機構, 准教授 (40451819) 石渡弘治金沢大学, 数物科学系, 准教授 (40754271) 北野龍一郎大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (50543451) 永田夏海東京大学, 大学院理学系研究科(理学部), 助教 (60794328)
Project Period (FY)	2018-06-29 – 2023-03-31
Keywords	素粒子理論 / 初期宇宙論 / 超弦理論
Outline of Final Research Achievements	This project aims to link fundamental theories including particle phenomenology, cosmology, and string theory through various symmetries that appear in neutrino physics, and to obtain innovative results, such as proposing new theoretical hypotheses, and to expand the range of new physics that can be explored in neutrino physics. During the period of this research, we have achieved results in a wide range of research related to new physics, such as the relationship between new models of the origin of matter-antimatter asymmetry and neutrino experiments, reexamination of proton decay in the Grand Unified Model, devising new inflationary models, devising new dark matter models, studying new aspects of phase defects that appear in the early universe, and classifying vacuum solutions in string theory. He has achieved results in a wide range of research related to new physics, such as the classification of vacuum solutions of superstring theory.
Free Research Field	素粒子理論
Academic Significance and Societal Importance of the Research Achievements	宇宙の物質・反物質非対称性、暗黒物質、暗黒エネルギー、初期宇宙におけるインフレーションの存在が確定的となっている現在、標準模型を超えたより大きな枠組みが必要である。そしてその大きな枠組みの構築には TeV スケールを超える新物理を探ることが不可欠となっている。本研究で得られた物質反物質の非対称性の新たな起源の模型とニュートリノ実験の関係、大統一模型における陽子崩壊の再検討、新たなインフレーション模型の考案、暗黒物質模型の考案、宇宙初期に現れる位相欠陥の新たな側面の研究、超弦理論の真空解の分類などの新物理に関わる新たな提案は今後の究極理論の探究の重要な手がかりを与える。