| Co-Investigator(Kenkyū-buntansha) |
須佐 元 甲南大学, 理工学部, 教授 (00323262)
町田 正博 九州大学, 理学研究院, 准教授 (10402786)
谷川 衝 東京大学, 大学院総合文化研究科, 助教 (20550742)
細川 隆史 京都大学, 理学研究科, 准教授 (30413967)
藤井 通子 東京大学, 大学院理学系研究科(理学部), 准教授 (90722330)
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| Budget Amount *help |
¥122,980,000 (Direct Cost: ¥94,600,000、Indirect Cost: ¥28,380,000)
Fiscal Year 2021: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2020: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2019: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2018: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2017: ¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
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| Outline of Final Research Achievements |
The origin of black hole (BH) binaries, which are gravitational wave sources, was investigated through theoretical research. The main results obtained are as follows:
1)Concerning the formation of isolated massive binary systems, we studied the properties of massive binaries that could form in the low-metallicity environment of the early universe. We found that the first stars can form as massive binary systems with masses ranging from several tens of solar masses. 2) The evolution of low-metallicity binary systems was examined using an analytical model. We demonstrated that there is no contradiction even if all the BH mergers observed through gravitational wave detection originate from isolated binary systems. 3) The formation rate of binary black holes due to dynamic interactions between stars was estimated through gravitational N-body simulations of cluster evolution. We found that even in open clusters, binary black holes can form through the dynamic interactions between stars.
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