| Project/Area Number |
20H01896
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Melia Thomas 東京大学, カブリ数物連携宇宙研究機構, 准教授 (30814909)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2023: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Keywords | Dark matter / Effective field theory / effective field theory / sub-MeV dark matter / light dark matter / Dark Matter / Particle Detectors / Sub-MeV dark matter / Light dark matter / dark matter / Sub MeV / Direct detection |
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| Outline of Research at the Start |
Determining the nature of Dark Matter (DM) is one of the most pressing challenges in physics, and the endeavour to directly detect DM on Earth must confront a vast, observationally allowed DM mass range. Next-generation DM detectors are being developed to access a new, large, and viable parameter space where DM has a mass below an MeV (sub-MeV DM).
New theoretical insights are required to estimate the sensitivities to DM in this regime. This project will develop a new, systematic theoretical understanding of the interactions of sub-MeV DM with newly proposed detectors.
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| Outline of Final Research Achievements |
This research furthered our understanding of effective field theory, developing and generalising previously known techniques for their construction so as to be applicable to a much wider range of physical systems. A key achievement was to develop a broader understanding of the effective field theories relevant for dark matter direct detection in the case that the dark matter has a de Broglie wavelength greater than the interatomic spacing of condensed matter systems. New effective field theories that describe the phonons within such condensed matter systems were written down. A new understanding of so-called outer-automorphism symmetries was uncovered. A new way of breaking a symmetry but not having any Nambu-Goldstone bosons in the effective field theory was elucidated.
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| Academic Significance and Societal Importance of the Research Achievements |
Dark matter is one of the greatest puzzles in physics, and is a mystery that has gone unsolved for decades. Understanding the nature of dark matter has a direct impact on our very own existence in the universe, since without the effect of dark matter on the cosmos, we would not be here.
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