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Analysis and geometry of fractals and stochastic processes on them from field-transverse viewpoints

Research Project

Project/Area Number 18H01123
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionKyoto University (2020-2022)
Kobe University (2018-2019)

Principal Investigator

KAJINO Naotaka  京都大学, 数理解析研究所, 准教授 (90700352)

Co-Investigator(Kenkyū-buntansha) 白石 大典  京都大学, 情報学研究科, 准教授 (00647323)
中島 誠  名古屋大学, 多元数理科学研究科, 准教授 (60635902)
田中 亮吉  京都大学, 理学研究科, 准教授 (80629759)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsフラクタル上の解析学 / 劣ガウス型熱核評価 / エネルギー測度 / ウォーク次元 / ランダム環境中のディレクティドポリマー / 群上の調和解析 / 3次元ループ除去ランダムウォーク / 3次元一様全域木 / 調和関数 / 乗法型確率熱方程式 / 曲面群 / フラクタル上のポテンシャル論 / フラクタル上の確率過程 / Liouville Brown運動 / フラクタル上の確率熱方程式 / 測度のマルチフラクタル解析 / 双曲群 / ポテンシャル論 / ランダム媒質中のディレクティドポリマー / 自由エネルギー / フラクタル幾何学
Outline of Final Research Achievements

As the main results of this research project, the principal investigator has proved the following. Heat diffusions on fractals can be universally uniformized to be arbitrarily close to being Gaussian, in the sense that the walk dimension (the exponent representing the scaling relation between time and space variables) can be made arbitrarily close to 2 by changes of the diffusion speed and the metric, but can be uniformized to be Gaussian only in very limited cases. It has also been revealed how the walk dimension of the diffusion is related to the singularity of the energy measures (measures representing the energy of functions on each set, which correspond to the integral of the square of the length of the gradient vector). Moreover, the co-investigators have advanced the understanding of various important objects related to fractals such as statistical physics models over fractals, harmonic analysis on groups, and the 3-dimensional loop-erased random walks and uniform spanning tree.

Academic Significance and Societal Importance of the Research Achievements

ウォーク次元とエネルギー測度の特異性の関係は当該分野における20数年来の未解決予想であり,これを肯定的に解決できたことは熱拡散が劣ガウス的である(ユークリッド空間における通常の熱拡散よりも真に遅い)こととエネルギー測度の間の最も基本的な関係を定理として確立した意義深い結果である.フラクタル上の熱拡散ではウォーク次元を2にいくらでも近くできるが2にできるのは稀,という結果は,「フラクタルの幾何構造を,熱拡散の速さとの兼ね合いでどこまで滑らかなものに変形できるか」という自然な問いに答えるものであり,フラクタルにおける幾何と熱拡散の間の複雑な関係の一端を明らかにしたその意義は大きい.

Report

(5 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (64 results)

All 2023 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (10 results) Journal Article (11 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 11 results,  Open Access: 6 results) Presentation (32 results) (of which Int'l Joint Research: 20 results,  Invited: 21 results) Remarks (7 results) Funded Workshop (4 results)

  • [Int'l Joint Research] University of British Columbia(カナダ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Universite de Montpellier(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of California, San Diego(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Chicago(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Peking University(中国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of British Columbia(カナダ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Weizmann Institute of Science(イスラエル)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] University of British Columbia(カナダ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Cambridge(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Cambridge(英国)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] On the conformal walk dimension: quasisymmetric uniformization for symmetric diffusions2023

    • Author(s)
      N. Kajino and M. Murugan
    • Journal Title

      Invent. Math.

      Volume: 231 Issue: 1 Pages: 263-405

    • DOI

      10.1007/s00222-022-01148-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An elementary proof that walk dimension is greater than two for Brownian motion on Sierpinski carpets2023

    • Author(s)
      Naotaka Kajino
    • Journal Title

      Bulletin of the London Mathematical Society

      Volume: 55 Issue: 1 Pages: 508-521

    • DOI

      10.1112/blms.12742

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fluctuations of two-dimensional stochastic heat equation and KPZ equation in subcritical regime for general initial conditions2023

    • Author(s)
      Shuta Nakajima
    • Journal Title

      ELECTRONIC JOURNAL OF PROBABILITY

      Volume: 28 Issue: none Pages: 1-33

    • DOI

      10.1214/22-ejp885

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On singularity of energy measures for symmetric diffusions with full off-diagonal heat kernel estimates II: Some borderline examples2022

    • Author(s)
      Naotaka Kajino
    • Journal Title

      Springer Proceedings in Mathematics & Statistics

      Volume: 394 Pages: 223-251

    • DOI

      10.1007/978-981-19-4672-1_13

    • ISBN
      9789811946714, 9789811946721
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Holder continuity of the scaling limit of three-dimensional loop-erase loop-erased random walk2022

    • Author(s)
      Xinyi Li and Daisuke Shiraishi
    • Journal Title

      Electronic Journal of Probability

      Volume: 27 Issue: none Pages: 1-37

    • DOI

      10.1214/22-ejp869

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Law of large numbers and fluctuations in the sub-critical and L2 regions for SHE and KPZ equation in dimension d≧32022

    • Author(s)
      Clement, Cosco. Shuta, Nakajima. Makoto Nakashima
    • Journal Title

      Stochastic Processes and their Applications

      Volume: 151 Pages: 127-173

    • DOI

      10.1016/j.spa.2022.05.010

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Topological flows for hyperbolic groups2021

    • Author(s)
      TANAKA RYOKICHI
    • Journal Title

      Ergodic Theory and Dynamical Systems

      Volume: 41 Issue: 11 Pages: 3474-3520

    • DOI

      10.1017/etds.2020.101

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Uniformizing surfaces via discrete harmonic maps2021

    • Author(s)
      Kajigaya Toru、Tanaka Ryokichi
    • Journal Title

      Annales Henri Lebesgue

      Volume: 4 Pages: 1767-1807

    • DOI

      10.5802/ahl.116

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Random walks on the discrete affine group2021

    • Author(s)
      Brieussel Jeremie、Tanaka Ryokichi、Zheng Tianyi
    • Journal Title

      Groups, Geometry, and Dynamics

      Volume: 15 Issue: 3 Pages: 935-963

    • DOI

      10.4171/ggd/616

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Scaling limits of the three-dimensional uniform spanning tree and associated random walk2021

    • Author(s)
      Omer Angel, David A. Croydon, Sarai Hernandez-Torres and Daisuke Shiraishi
    • Journal Title

      The Annals of Probability

      Volume: 49 Issue: 6 Pages: 3032-3105

    • DOI

      10.1214/21-aop1523

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On singularity of energy measures for symmetric diffusions with full off-diagonal heat kernel estimates2020

    • Author(s)
      Naotaka Kajino and Mathav Murugan
    • Journal Title

      The Annals of Probability

      Volume: 48 Issue: 6 Pages: 2920-2951

    • DOI

      10.1214/20-aop1440

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Sub-Gaussian heat kernel bounds and singularity of energy measures for symmetric diffusions2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      OIST Analysis on Metric Spaces Seminar
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] On singularity of energy measures for symmetric diffusions with full off-diagonal heat kernel estimates2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      7th Cornell Conference on Analysis, Probability, and Mathematical Physics on Fractals
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quasisymmetric Gaussian uniformization is impossible for Brownian motion on the Sierpinski carpet2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      International Workshop on Dirichlet Forms and Related Topics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On singularity of energy measures for symmetric diffusions with full off-diagonal heat kernel estimates II: Some borderline examples2022

    • Author(s)
      梶野 直孝
    • Organizer
      2022年度日本数学会秋季総合分科会・統計数学分科会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Quasisymmetric Gaussian uniformization is impossible for Brownian motion on the Sierpi\'{n}ski carpet2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      Open Japanese-German conference on stochastic analysis and applications
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quasisymmetric Gaussian uniformization is impossible for Brownian motion on the Sierpinski carpet2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      Heat Kernels, Stochastic Processes and Functional Inequalities
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Conformal walk dimension: its universal value and the non-attainment for the Sierpinski carpet2022

    • Author(s)
      Naotaka Kajino
    • Organizer
      Smooth Functions on Rough Spaces and Fractals with Connections to Curvature Functional Inequalities
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Gaussian fluctuations of stochastic heat equation and KPZ equation in higher dimension in $L^2$ regime2022

    • Author(s)
      Makoto Nakashima
    • Organizer
      Workshop on Probabilistic Methods in Statistical Mechanics of Random Media and Random Fields 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ランダムウォークの衝突回数の末尾確率に対する上下評価2021

    • Author(s)
      梶野 直孝
    • Organizer
      無限粒子系、確率場の諸問題XVI
    • Related Report
      2021 Annual Research Report
  • [Presentation] Conformal walk dimension: its universal value and the non-attainment for the Sierpinski carpet2021

    • Author(s)
      Naotaka Kajino
    • Organizer
      Pacific Workshop on Probability and Statistical Physics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the conformal walk dimension II: Non-attainment for some Sierpinski carpets2021

    • Author(s)
      梶野 直孝
    • Organizer
      2021年度確率論シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Fluctuation in L^2-region for stochastic heat equation and KPZ equation in higher dimension2021

    • Author(s)
      中島 誠
    • Organizer
      関西確率論セミナー
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Gaussian fluctuations of stochastic heat equation and KPZ equation in higher dimension in subcritical regime2021

    • Author(s)
      Makoto Nakashima
    • Organizer
      Rigorous Statistical Mechanics and Related Topics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 高次元確率熱方程式とKPZ方程式のL2-領域における解の摂動2021

    • Author(s)
      中島 誠
    • Organizer
      The 19th Symposium Stochastic Analysis on Large Scale Interacting Systems
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] The Manhattan curve and rough similarity rigidity2021

    • Author(s)
      Ryokichi Tanaka
    • Organizer
      Pacific Dynamics Seminar
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The Manhattan curve and rough similarity rigidity2021

    • Author(s)
      Ryokichi Tanaka
    • Organizer
      Ohio State University, Ergodic Theory Seminar
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Glauber-Exclusion dynamics: rapid mixing regime2021

    • Author(s)
      田中 亮吉
    • Organizer
      The 19th Symposium Stochastic Analysis on Large Scale Interacting Systems
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Convergence of three-dimensional loop-erased random walk in the natural parameterization2021

    • Author(s)
      Daisuke Shiraishi
    • Organizer
      The 10th International Conference on Stochastic Analysis and its Applications
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] An elementary proof of walk dimension being greater than two for Brownian motion on Sierpinski carpets2021

    • Author(s)
      梶野 直孝
    • Organizer
      2021年度日本数学会年会・統計数学分科会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Uniform spanning tree in three dimensions2021

    • Author(s)
      Daisuke Shiraishi
    • Organizer
      Rigorous Statistical Mechanics and Related Topics III
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Sub-Gaussian heat kernel bounds imply singularity of energy measures2020

    • Author(s)
      Naotaka Kajino
    • Organizer
      International Conference: ``Bernoulli-IMS One World Symposium 2020''
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A bridge between elliptic and parabolic Harnack inequalities2020

    • Author(s)
      梶野 直孝
    • Organizer
      RIMS共同研究(公開型)「2020年度確率論シンポジウム」
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高次元確率熱方程式とKPZ方程式の$L^2$-領域における摂動2020

    • Author(s)
      中島 誠
    • Organizer
      RIMS共同研究(公開型)「2020年度確率論シンポジウム」
    • Related Report
      2020 Annual Research Report
  • [Presentation] Topological flows for hyperbolic groups2020

    • Author(s)
      Ryokichi Tanaka
    • Organizer
      Geometric Group Theory in East Asia
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tail probability estimates for the collision number of recurrent random walks with on-diagonal heat kernel upper bounds2020

    • Author(s)
      梶野 直孝
    • Organizer
      研究集会「無限粒子系、確率場の諸問題XV」
    • Related Report
      2019 Annual Research Report
  • [Presentation] Sub-Gaussian heat kernel bounds imply singularity of energy measures2019

    • Author(s)
      Naotaka Kajino
    • Organizer
      Japanese-German Open Conference on Stochastic Analysis 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Sub-Gaussian heat kernel bounds imply singularity of energy measures2019

    • Author(s)
      Naotaka Kajino
    • Organizer
      International Conference on Analysis and PDEs on Manifolds and Fractals
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Scaling limit of uniform spanning tree in three dimensions2019

    • Author(s)
      Daisuke Shiraishi
    • Organizer
      Heat Kernels, Stochastic Processes and Functional Inequalities, Workshop at Mathematisches Forschungsinstitut Oberwolfach
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Scaling limit of uniform spanning tree in three dimensions2019

    • Author(s)
      Daisuke Shiraishi
    • Organizer
      Probability seminar at Peking University
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Sub-Gaussian heat kernel bounds imply singularity of energy measures2019

    • Author(s)
      梶野 直孝
    • Organizer
      2019年度確率論シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] Dimension of harmonic measures in hyperbolic spaces2019

    • Author(s)
      Ryokichi Tanaka
    • Organizer
      Conference in Geometric Group Theory, Beijing International Center for Mathematical Research (BICMR), Beijing, China
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of Brownian motion2018

    • Author(s)
      Daisuke Shiraishi
    • Organizer
      2nd Hong Kong/Kyoto Workshop on ``Fractal Geometry and Related Areas''
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] Publications and preprints

    • URL

      https://www.kurims.kyoto-u.ac.jp/~nkajino/publications.html

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 梶野 直孝|京都大学数理解析研究所

    • URL

      https://www.kurims.kyoto-u.ac.jp/ja/list/kajino.html

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] Makoto Nakashima's web site

    • URL

      https://www.math.nagoya-u.ac.jp/~nakamako/

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] Ryokichi Tanaka

    • URL

      https://ryokichitanaka.github.io

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 白石 大典(情報学研究科 情報学専攻応用解析学講座) | 京都大学 教育研究活動データベース

    • URL

      https://kdb.iimc.kyoto-u.ac.jp/profile/ja.f6a26c885ba820ce.html

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] Publications and preprints

    • URL

      http://www.math.kobe-u.ac.jp/HOME/nkajino/publications.html

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
  • [Remarks] 神戸大学理学部数学科・各教員の研究活動・梶野 直孝

    • URL

      http://www.math.kobe-u.ac.jp/home-j/index7-2-27.html

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
  • [Funded Workshop] Analysis and geometry of fractals and metric spaces: Recent developments and future prospects2023

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] Analysis and geometry of fractals and metric spaces: Recent developments and future prospects2021

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] Kobe Workshop on Probabilistic Potential Theory and Related Fields2019

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] RIMS共同研究(公開型)「ガウス自由場および関連する話題」(Gaussian Free Fields and Related Topics)2018

    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2024-01-30  

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