| Project/Area Number |
21740188
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
TATEKAWA Takayuki Japan Atomic Energy Agency, システム計算科学センター, 博士研究員 (60350477)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 統計物理 / 重力 / 長距離力 / N体シミュレーション / 非平衡 / GPGPU / 統計力学 / 多体問題 / 緩和過程 |
|---|
| Research Abstract |
In long-range interacting systems such as self-gravitating system, it is known that relaxation time is quite long. Then during relaxation process in the long-range interacting systems, quasi-equilibrium state which is independent of initial conditions often appears. We discuss the models which can describe the quasi-equilibrium state with both analytic methods from statistical mechanics and N-body particles simulation. Then we showed that the density distribution of King model is represented by using Langevin equation in self-gravitating system. We showed that, in negative specific heat region, the quasi-equilibrium state in 2-dimensional HMF model can be fitted by maximum state of non-extensive entropy. On the other hand, in positive specific heat region, we cannot fit the quasi-equilibrium state with maximum state of non-extensive entropy.
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