| Project/Area Number |
21K13911
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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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 |
Ata Metin 東京大学, カブリ数物連携宇宙研究機構, 客員准科学研究員 (60836229)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | Large-scale structure / Gravitational waves / Large-scale structures / Cosmological Simulations / Gravitational Waves / Balck holes / High redshift galaxies / Binary black holes / Constrained simulations / Young galaxy clusters |
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| Outline of Research at the Start |
As a first step I will run constrained simulations of young galaxy clusters of which I reconstructed the initial conditions in a previous work. The idea is to first use dark matter simulations to show that we can predict the further evolution of these clusters. Once this first project is successfully finished, we will go ahead and run hydrodynamical simulations. These simulations will incorporate star formation models that we will use to predict the formation of binary black holes and gravitational wave. With this work we can improve the physics of star formation by comparing to observations.
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| Outline of Final Research Achievements |
I initially designed this project to utilize high redshift density reconstructions that I was working on at the moment. The idea of using density maps located in the era of maximum star formation is motivated as merging stellar remnants such as neutron stars and black holes, are the astrophysical sources of gravitational waves.
I was able to accomplish to close the gap of observational studies and cosmological simulations, however, I had to restructure the project in a general way. The initial idea to resolve stellar size that lie in the LIGA-VIRGO-KARGA frequency band turned out to be unfeasible. Therefore, I switched the focus to the Stochastic gravitational wave background in the nano-hertz band that is sourced by merging super-massive blackholes. These objects can very accurately be resolved in large-scale cosmological simulations, which makes this project an ideal use-case for the new density maps that I am creating now.
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| Academic Significance and Societal Importance of the Research Achievements |
The confirmation of the stochastic gravitational wave background by the NANOGrav collaboration last year boosted the significance of this project massively, especially our unique ability to estimate the anisotropies in the stochastic background.
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