2022 Fiscal Year Final Research Report
Exploration of dark satellites driven by N-body simulations focusing on stellar streams
| Project/Area Number |
20K14517
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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 16010:Astronomy-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MIKI Yohei 東京大学, 情報基盤センター, 助教 (70734375)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 重力多体シミュレーション / 銀河進化 / 銀河衝突 / 銀河考古学 / GPUを用いた演算加速 / 銀河と中心ブラックホールの共進化 |
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| Outline of Final Research Achievements |
We have optimized an N-body simulation code for the latest GPUs to reduce the time-to-solution of galaxy collision simulations. As a result, NVIDIA A100 achieved 1.2 to 1.6-fold acceleration compared to NVIDIA V100, and NVIDIA H100 PCIe is 1.3 to 1.4 times faster than NVIDIA A100. In addition, we have also improved resource utilization during the galaxy collision simulations: the code simultaneously performs N-body simulation on GPU and data analysis on CPU.
We have performed galaxy collision simulations and revealed that a head-on collision of galaxies could strip gas surrounding a massive black hole at the galactic center. Because the surrounding gas is considered the fueling source of the massive black hole, galaxy collisions can shut down the nucleus activity.
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| Free Research Field |
宇宙物理学
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| Academic Significance and Societal Importance of the Research Achievements |
最新世代のGPUを対象とした性能最適化によって理論ピーク性能比以上の性能向上を達成し，また限られた計算機資源のより効率的な利用にも寄与した．
銀河衝突は銀河中心ブラックホール活動を活性化させるのみだと考えられていたが，銀河の衝突軌道によっては逆に不活性化させる場合もあることを示し，ブラックホールと銀河がお互いに影響を及ぼし合いながら進化していく過程を理解する上で重要な知見をもたらした．
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