| Project/Area Number |
21H04476
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
Leonardi Matteo 国立天文台, 重力波プロジェクト, 特別客員研究員 (90816448)
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| Co-Investigator(Kenkyū-buntansha) |
麻生 洋一 国立天文台, 重力波プロジェクト, 准教授 (10568174)
道村 唯太 東京大学, 大学院理学系研究科(理学部), 客員共同研究員 (80747006)
Zhao Yuhang 東京大学, 宇宙線研究所, 特任研究員 (70897834)
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| Project Period (FY) |
2021-04-05 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥37,050,000 (Direct Cost: ¥28,500,000、Indirect Cost: ¥8,550,000)
Fiscal Year 2023: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2022: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2021: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
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| Keywords | quantum noise / gravitational wave / KAGRA / filter cavity / freq. dep. squeezing |
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| Outline of Research at the Start |
At five years from the first detection of a gravitational wave (GW) coming from the collapse of two black holes, almost one hundred more have been detected. To keep pushing this trend, the GW detectors need to be improved. In particular, for all the detectors, especially the Japanese detector KAGRA, the main limitation is its quantum noise. This research will provide crucial information on frequency dependent squeezing, support the development of coupled-cavities control schemes and drive the realization of new techniques to fight one of the most limiting noises in GW detectors.
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| Outline of Final Research Achievements |
The first detection of gravitational waves in 2015 opened the era of gravitational wave astronomy. With this new field of research, we can explore the universe in previously unknown ways and better comprehend the behavior gravity. To increase the number of detections of gravitational waves, the sensitivity of gravitational wave detectors needs to be improved. The most fundamental noise which limits the sensitivity of gravitational wave detector is the quantum noise of light. To suppress this noise, the quantum properties of light need to be manipulated in order to create what is called a squeezed vacuum state.
In 2020 our research group produced the first ever frequency dependent squeezing (FDS) for gravitational waved detectors. This project successfully addressed many noise sources and investigated several limitations to the application of FDS to gravitational wave detectors.
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| Academic Significance and Societal Importance of the Research Achievements |
With this project, the capability of potentially reducing the quantum noise in gravitational wave detectors has been enhanced. Therefore, the capability of observing our universe via the gravitational wave channel has been increased, providing additional and new information to the general public.
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