Direct integration of the collisionless Boltzmann equation
| Project/Area Number |
25610050
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YOSHIDA Naoki 東京大学, 大学院理学系研究科(理学部), 教授 (90377961)
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| Research Collaborator |
TANAKA Satoshi 筑波大学, 計算物理研究センター, 研究員 (10783722)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | ボルツマン方程式 / プラズマ物理 / 宇宙の構造形成 / ニュートリノ / 数値計算 / 宇宙論 / 数値シミュレーション / 宇宙物理学 / プラズマ物理学 |
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| Outline of Final Research Achievements |
We have developped a new parallel Vlasov-Poisson solver for simulations of self-gravitating systems. the basic scheme is based on spatially 5-th order or 7th order interpolation, and assures monotonicity and positivity preservation of the velocity distribution function. We performed a series of test simulations including free-streaming and nonlinear Landau damping, and confirmed that our new scheme performs better than the other existing methods. In the final project year, we developed a hybrid code that integrates the Vlasov equation to follow the dynamics of cosmic neutrinos, whereas following the structure formation by a conventional N-body method. We performed cosmological simulations using the hybrid code.
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Report
(5 results)
Research Products
(9 results)
