Comprehensive search for anisotropy in the speed of light using an optical ring cavity
| Project/Area Number |
18H01224
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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 15020:Experimental 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 |
Michimura Yuta 東京大学, 大学院理学系研究科(理学部), 助教 (80747006)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2018: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Keywords | ローレンツ不変性 / 異方性 / 光共振器 / 標準理論 / 相対性理論 / 干渉計 / レーザー / 対称性 |
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| Outline of Final Research Achievements |
We have developed an experimental setup for improved search for Lorentz violation, and performed various noise analysis and reductions. The search is done by measuring the resonant frequency difference between two counterpropagating directions of an optical ring cavity. Our cavity contains a silicon piece to make the cavity asymmetric, and to make it sensitive to the difference between the speed of light propagating in opposite directions. We have integrated a monolithic optical bench to reduce vibration noise on a rotation table with an improved stability and continuous rotation, which were previously developed by our group. With this complete setup, a number of noises were investigated and reduced. Although there is still a noise peak at the rotational frequency, we have successfully improved the floor noise level by two orders of magnitude.
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| Academic Significance and Societal Importance of the Research Achievements |
光速の等方性は光子のローレンツ不変性と結びついており、光速の異方性探査はローレンツ不変性の破れを探査していることになる。特殊相対性理論の発表から100年以上の間、様々な方法による実験的検証が世界中で行われてきたことで、ローレンツ不変性は全て物理学の基礎原理となっている。しかし、統一理論に向けた理論研究などにより、あるエネルギースケールではローレンツ不変性が破れている可能性が示唆されており、ローレンツ不変性の破れ探査実験はこれまでになく重要となっている。我々が開発した実験装置により、このローレンツ不変性を高精度に検証、またはその綻びを探索することが可能になる。
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Report
(5 results)
Research Products
(127 results)
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[Journal Article] First observation and analysis of DANCE: Dark matter Axion search with riNg Cavity Experiment2021
Author(s)
Yuka Oshima, Hiroki Fujimoto, Masaki Ando, Tomohiro Fujita, Jun'ya Kume, Yuta Michimura, Soichiro Morisaki, Koji Nagano, Hiromasa Nakatsuka, Atsushi Nishizawa, Ippei Obata, Taihei Watanabe
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Journal Title
Journal of Physics: Conference Series
Volume: 2156
Issue: 1
Pages: 12042-12042
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Improvement of the Target Sensitivity in DECIGO by Optimizing Its Parameters for Quantum Noise Including the Effect of Diffraction Loss2021
Author(s)
Tomohiro Ishikawa, Shoki Iwaguchi, Yuta Michimura, Masaki Ando, Rika Yamada, Izumi Watanabe, Koji Nagano, Tomotada Akutsu, Kentaro Komori, Mitsuru Musha, Takeo Naito, Taigen Morimoto, Seiji Kawamura
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Journal Title
Galaxies
Volume: 9
Issue: 1
Pages: 14-14
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Quantum Noise in a Fabry-Perot Interferometer Including the Influence of Diffraction Loss of Light2021
Author(s)
Shoki Iwaguchi, Tomohiro Ishikawa, Masaki Ando, Yuta Michimura, Kentaro Komori, Koji Nagano, Tomotada Akutsu, Mitsuru Musha, Rika Yamada, Izumi Watanabe, Takeo Naito, Taigen Morimoto, Seiji Kawamura
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Journal Title
Galaxies
Volume: 9
Issue: 1
Pages: 9-9
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] 超精密フォーメーションフライト実証機SILVIAによる重力波観測の可能性2020
Author(s)
道村唯太, 五十里哲, 安東正樹, 伊藤琢博, 河野功, 船木一幸, 坂井真一郎, 和泉究, 長野晃士, 佐藤修一, 武者満, 佐藤訓志, 山田克彦, 松尾太郎, 金田英宏, 川村静児, 阿久津智忠, 正田亜八香, SILVIA 検討グループ
Organizer
第64回宇宙科学技術連合講演会
Related Report
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[Presentation] Optimization of the KAGRA sensitivity2018
Author(s)
Yuta Michimura, Kentaro Komori, Atsushi Nishizawa, Hiroki Takeda, Koji Nagano, Yutaro Enomoto, Kazuhiro Hayama, Kentaro Somiya, Masaki Ando, Sadakazu Haino
Organizer
The 4th KAGRA International Workshop
Related Report
Int'l Joint Research
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