• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2021 Fiscal Year Annual Research Report

Stochastic chaos in random dynamical systems

Research Project

Project/Area Number 18K03441
Research InstitutionHokkaido University

Principal Investigator

佐藤 譲  北海道大学, 電子科学研究所, 准教授 (30342794)

Co-Investigator(Kenkyū-buntansha) 角 大輝  京都大学, 人間・環境学研究科, 教授 (40313324)
矢野 孝次  京都大学, 理学研究科, 准教授 (80467646)
Project Period (FY) 2018-04-01 – 2022-03-31
Keywordsrandom dynamical systems / stochastic bifurcation / random strange attractor / stochastic chaos / comput. ergodic theory
Outline of Annual Research Achievements

本研究ではランダム力学系で生じる複雑現象の統一的体系化を軸として、ランダム非線形現象論を一層発展させることを目指す。代表者の先行研究で発見された確率分岐、統計的概周期性、雑音誘起再現性はこれまでに知られていなかった雑音誘起現象である。ランダム力学系の確率カオスについてはこれまで数学的研究がなされてきたが、非線形物理学としての研究は少ない。例えばランダムストレンジアトラクターの数学的定義は存在するが、その物理的性質は不明である。さらに代表者らの研究によりKarman旋回流でランダムストレンジアトラクターが実測されている。さらに確率Lorenz系でノイズが大きくなるにつれて緩和時間が長くなることがわかるなど、決定論力学系ではみられなかった新しい現象が複数発見された。
今年度は以下の課題(A), (C)を実施し、論文出版済みである。
(A)確率カオスの普遍性の分析: Lasota-Mackey写像の雑音誘起現象について、計算エルゴード理論に基づく計算機援用証明により、少なくとも3回の転移が生じていることを示した。
(C)確率カオスの予測可能性の定量化: ランダム力学系の生成エントロピーをtransfer entropyに基づいて定義した。応用研究として機械学習のランダム力学系解析を新たに行い、2020年9月にImperial College Londonで開催された研究 Dynamical systems and machinelearning、同年9月に京都大学で開催された研究会数理科学の諸問題と力学系理論の新展開で講演を行った.

  • Research Products

    (27 results)

All 2022 2021 Other

All Int'l Joint Research (6 results) Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (14 results) (of which Int'l Joint Research: 7 results,  Invited: 9 results)

  • [Int'l Joint Research] 華北電力大学(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      華北電力大学
  • [Int'l Joint Research] CIMAT(メキシコ)

    • Country Name
      MEXICO
    • Counterpart Institution
      CIMAT
  • [Int'l Joint Research] ピサ大学(イタリア)

    • Country Name
      ITALY
    • Counterpart Institution
      ピサ大学
  • [Int'l Joint Research] UFRJ(ブラジル)

    • Country Name
      BRAZIL
    • Counterpart Institution
      UFRJ
  • [Int'l Joint Research] University of North Texas/Ball State University/University of Rhode Island(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      University of North Texas/Ball State University/University of Rhode Island
  • [Int'l Joint Research]

    • # of Other Countries
      1
  • [Journal Article] Infinite convolutions of probability measures on Polish semigroups2022

    • Author(s)
      Kouji Yano
    • Journal Title

      Probab. Surveys

      Volume: 19 Pages: 129--159

    • DOI

      10.1214/22-ps6

    • Peer Reviewed / Open Access
  • [Journal Article] Existence of multiple noise-induced transitions in Lasota_Mackey maps2022

    • Author(s)
      Takumi Chihara, Yuzuru Sato, Isaia Nisoli, and Stefano Galatolo
    • Journal Title

      Chaos

      Volume: 32 Pages: 13117

    • DOI

      10.1063/5.0070198

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Noise-induced degeneration in online learning2022

    • Author(s)
      YuzuruSato, DaijiTsutsui, AkioFujiwara
    • Journal Title

      Physica D

      Volume: 430 Pages: 133095

    • DOI

      10.1016/j.physd.2021.133095

    • Peer Reviewed
  • [Journal Article] Non-i.i.d. random holomorphic dynamical systems and the generic dichotomy2022

    • Author(s)
      Hiroki Sumi and Takayuki Watanabe
    • Journal Title

      Nonlinearity

      Volume: 35 Pages: 1857--1877

    • DOI

      10.1088/1361-6544/ac4a89

    • Peer Reviewed
  • [Journal Article] Examples of third noise problems for action evolutions with infinite past2021

    • Author(s)
      Yu Ito, Toru Sera and Kouji Yano
    • Journal Title

      Research on the Theory of Random Dynamical Systems and Fractal Geometry, RIMS Kokyuroku

      Volume: 2176 Pages: 20--27

    • Open Access
  • [Journal Article] Negativity of Lyapunov Exponents and Convergence of Generic Random Polynomial Dynamical Systems and Random Relaxed Newton's Methods2021

    • Author(s)
      Hiroki Sumi
    • Journal Title

      Comm. Math. Phys.

      Volume: 384 Pages: 1513--1583

    • DOI

      10.1007/s00220-021-04070-6

    • Peer Reviewed
  • [Journal Article] Uniformly perfect and hereditarily non-uniformly perfect analytic and conformal non-autonomous attractor sets2021

    • Author(s)
      Mark Comerford, Kurt Falk, Rich Stankewitz, Hiroki Sumi
    • Journal Title

      Dynamical Systems

      Volume: 36 Pages: 631--655

    • DOI

      10.1080/14689367.2021.1975262

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Arcsine law for a piecewise linear random map2021

    • Author(s)
      Kouji Yano
    • Organizer
      Session "Ergodic Theory, Dynamical Systems, Fractals and Applications", CMS Summer Meeting
    • Int'l Joint Research / Invited
  • [Presentation] Arcsine law for a piecewise linear random interval map2021

    • Author(s)
      矢野孝次
    • Organizer
      ランダム力学系および多価写像力学系理論の総合的研究
    • Invited
  • [Presentation] Arcsine law for a piecewise linear random interval map2021

    • Author(s)
      矢野孝次
    • Organizer
      日本数学会秋季総合分科会統計数学分科会
  • [Presentation] Arcsine and Darling--Kac laws for piecewise linear random interval maps2021

    • Author(s)
      矢野孝次
    • Organizer
      エルゴード理論とその周辺
  • [Presentation] Arcsine and Darling--Kac laws for piecewise linear random interval maps2021

    • Author(s)
      矢野孝次
    • Organizer
      確率論シンポジウム
  • [Presentation] Local time penalizations with various clocks for Levy processes2021

    • Author(s)
      Kouji Yano
    • Organizer
      Nonlocality in Analysis, Probability and Statistics, MFO-RIMS Tandem Workshop
    • Int'l Joint Research / Invited
  • [Presentation] Stochastic chaos in random dynamical systems and its Applications2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      Mathematical Science of Complex Systems: Physics, Chemistry, Biology, Information and Chaos
    • Int'l Joint Research / Invited
  • [Presentation] Stochastic bifurcation in a turbulent swirling flow2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      RIMS workshop on dynamical systems
  • [Presentation] Stochastic bifurcation in a turbulent swirling flow2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      Mathematical methods for the studies of flow, shape, and dynamics
    • Int'l Joint Research
  • [Presentation] Existence of multiple noise-induced transitions in Lasota-Mackey map2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      Hokkaido Summer Institute on Computational Ergodic Theory
    • Int'l Joint Research / Invited
  • [Presentation] Stochastic bifurcation in a turbulent swirling flow2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      ダイナミカルシステムとその周辺
    • Invited
  • [Presentation] Stochastic bifurcation in a turbulent swirling flow2021

    • Author(s)
      Yuzuru Sato
    • Organizer
      17th Japan-Slovenia Seminar on Nonlinear Science
    • Int'l Joint Research / Invited
  • [Presentation] Random Dynamical Systems of Regular Polynomial Maps on C22021

    • Author(s)
      Hiroki Sumi
    • Organizer
      Dynamics of (Semi-)Group Actions
    • Int'l Joint Research / Invited
  • [Presentation] Random Dynamical Systems of Regular Polynomial Maps on C22021

    • Author(s)
      Hiroki Sumi
    • Organizer
      RIMS共同研究「ランダム力学系および多価写像力学系理論の総合的研究」
    • Invited

URL: 

Published: 2022-12-28  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi