| Project/Area Number |
15H03669
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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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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
Kitano Ryuichiro 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)
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| Co-Investigator(Kenkyū-buntansha) |
山田 憲和 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, 研究機関講師 (50399432)
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| Research Collaborator |
FRISON julien
MORI shingo
MATSUFURU hideo
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 素粒子論 |
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| Outline of Final Research Achievements |
In quantum field theory, particles are defined as excitations from the vacuum, but at the same time, the vacuum structure is determined by fields to describe particles. In gauge theory like QCD, the field configurations are defined as equivalent when they are related by a gauge transformation. The gauge transformation can actually "wind up" the space-time, that makes the vacuum to involve topologically non-trivial configurations. Such configurations are indeed important to understand the structure of the vacuum. In this research project, in order to understand the topological aspect of the gauge theories, various kinds of studies are performed. In particular, by using the simulations of the lattice gauge theories, new results are obtained in the high temperature physics and also the role played by quarks in the vacuum.
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| Academic Significance and Societal Importance of the Research Achievements |
アクシオンは、我々の素粒子の作り出す真空を変化させる仮想粒子で、宇宙の暗黒物質の候補である。暗黒物質となるには、宇宙の歴史において、アクシオンの質量がどのように変化してきたかを知る必要があった。そこで、本研究では格子QCDのシミュレーションの新手法を開発し、これまで計算可能でなかった高温領域でのアクシオン質量計算に成功した。その他、トーラス上のゲージ理論やクォーク質量の定義に関して新しい結果が得られた。これにより、我々の「真空」の理解は大きく進んだと言える。また、我々の宇宙がどのように成り立っているのかという根本的問題にも重要な知見が得られた。
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