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A classical mechanical model of diffusion process

Research Project

Project/Area Number 17K05290
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Basic analysis
Research InstitutionWaseda University (2019-2021)
University of Tsukuba (2017-2018)

Principal Investigator

Liang Song  早稲田大学, 教育・総合科学学術院, 教授 (60324399)

Project Period (FY) 2017-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords拡散過程 / 古典力学系 / 収束 / 確率過程の収束 / 低次元 / ブラウン運動 / 総エネルギー / 確率論
Outline of Final Research Achievements

We considered a system of one massive particle interacting with an ideal gas, evolved according to non-random Newton mechanical principles. Due to the possibility of re-interactions, the stochastic process that presents the behavior of the massive particle is not a Markov process. In this research, we considered the case where the interaction is a repulsive force, given by a potential function with compact support, and assumed that the initial energies of the light particles are bounded from below. We proved that under this condition, when the mass of the light particles converges to 0, the stochastic process that presents the behavior of the massive particle converges to a diffusion process.

Academic Significance and Societal Importance of the Research Achievements

拡散過程という現象を説明するために、今までの研究では必要であった「すべての軽粒子の初期エネルギーが十分高い」という人工的な条件を緩和し、「軽粒子の初期エネルギーは下から有界である」という条件だけでこの問題を研究することができ、より現実モデルと一致するような説明を与えることができた。
また、本研究で実用性が確認された、軽粒子の相互作用有効領域における滞在時間が有界でなくても、それに対する精密な評価を与えることにより、軽粒子の挙動は散乱で近似できるというアイデアは、これからの研究でも適用できる手法である。

Report

(6 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2021 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] A mechanical model of Brownian motion for one massive particle including low energy light particles in dimension d \ge 32021

    • Author(s)
      Song Liang
    • Journal Title

      Random Oper. Stoch. Equ

      Volume: 29 Issue: 3 Pages: 203-235

    • DOI

      10.1515/rose-2021-2062

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A mechanical model of Brownian motion for one massive particle including slow light particles2018

    • Author(s)
      Song Liang
    • Journal Title

      Journal of Statistical Physics

      Volume: 170 Issue: 2 Pages: 286-350

    • DOI

      10.1007/s10955-017-1934-4

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] A mechanical model of Brownian motion including low energy light particles2019

    • Author(s)
      Song, Liang
    • Organizer
      15th Workshop on Markov Processes and Related Topics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A mechanical model of Brownian motion2018

    • Author(s)
      Song Liang
    • Organizer
      Second Interdisciplinary and Research Alumni Symposium iJaDe2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Diffusion and classical dynamics2017

    • Author(s)
      Song Liang
    • Organizer
      Mathematical Aspects of Quantum Fields and Related Topics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 拡散過程の古典力学モデル--低エネルギー軽粒子が存在する場合について2017

    • Author(s)
      梁松
    • Organizer
      確率論シンポジウム 2017
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2023-01-30  

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