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Rough Path Theory via Complex Analysis

Research Project

Project/Area Number 18K13431
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionKyoto Sangyo University

Principal Investigator

Ito Yu  京都産業大学, 理学部, 准教授 (70779214)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsラフパス理論 / 複素解析 / 非整数階微積分 / ラフパス / 非整数階微分 / 非整数ブラウン運動 / 確率微分方程式 / ブラウン運動
Outline of Final Research Achievements

Using fractional calculus and complex analysis, we study an alternative approach to the fundamental theory of rough path analysis, and obtain some results on integrals along rough paths, called rough integrals. It is known that rough integrals play an important role in the fundamental theory of rough path analysis, e.g., the theory of differential equations driven by rough paths. We expect our results to provide more direct ways to the fundamental theory of rough path analysis and the applications to stochastic analysis.

Academic Significance and Societal Importance of the Research Achievements

本研究の特色は、ラフ積分と呼ばれるラフパス理論における線積分概念にある。通常のラフ積分の定義は補正されたリーマン-スティルチェス和の極限として与えられる。その一方、本研究のラフ積分の定義は補正された非整数階微分作用素を用いてルベーグ積分として明示的に与えられ、通常のラフ積分と比べて簡明な取り扱いを実現する。ラフパスで駆動される微分方程式の理論においてもラフ積分は重要であり、本研究はラフパス理論における線積分や微分方程式に対してより簡明な取り扱いを実現し、ラフパス理論を用いた確率解析の研究に新たな方法を提供することが期待される。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (17 results)

All 2024 2023 2022 2021 2020 2019 2018 Other

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 7 results) Remarks (1 results)

  • [Journal Article] A proof of the additivity of rough integral2024

    • Author(s)
      Ito Yu
    • Journal Title

      Stochastics and Dynamics

      Volume: - Issue: 01

    • DOI

      10.1142/s0219493724500060

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] BACKWARD REPRESENTATION OF THE ROUGH INTEGRAL: AN APPROACH BASED ON FRACTIONAL CALCULUS2023

    • Author(s)
      ITO Yu
    • Journal Title

      Kyushu Journal of Mathematics

      Volume: 77 Issue: 2 Pages: 367-384

    • DOI

      10.2206/kyushujm.77.367

    • ISSN
      1340-6116, 1883-2032
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Backward representation of rough integral: an approach based on fractional calculus2023

    • Author(s)
      Ito Yu
    • Journal Title

      Kyushu Journal of Mathematics

      Volume: -

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Resolution of Sigma-Fields for Multiparticle Finite-State Action Evolutions with Infinite Past2022

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

      Journal of Theoretical Probability

      Volume: - Issue: 3 Pages: 1-32

    • DOI

      10.1007/s10959-022-01219-4

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Integration with respect to Hoelder rough paths of order greater than 1/4: an approach via fractional calculu2021

    • Author(s)
      Ito Yu
    • Journal Title

      Collectanea Mathematica

      Volume: ー Issue: 1 Pages: 13-42

    • DOI

      10.1007/s13348-020-00305-2

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rough integration via fractional calculus2020

    • Author(s)
      Yu Ito
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 72 Issue: 1 Pages: 39-62

    • DOI

      10.2748/tmj/1585101620

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rough integration via fractional calculus2018

    • Author(s)
      Yu Ito
    • Journal Title

      Tohoku Mathematical Journal

      Volume: -

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] A fractional calculus approach to rough path integration2022

    • Author(s)
      Ito Yu
    • Organizer
      The 7th International Conference on Random Dynamical Systems
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Backward representation of rough integral: an approach via fractional calculus2022

    • Author(s)
      伊藤悠
    • Organizer
      岡山 確率解析ワークショップ2022
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Backward representation of rough integral: an approach via fractional calculus2022

    • Author(s)
      伊藤悠
    • Organizer
      日本数学会2022年度年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Rough path theory via fractional calculus2020

    • Author(s)
      伊藤 悠
    • Organizer
      確率論早春セミナー
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] A fractional calculus approach to rough path integration2019

    • Author(s)
      Yu Ito
    • Organizer
      One day workshop on stochastic analysis
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Integration with respect to Hoelder rough paths of order greater than 1/4: an approach via fractional calculus2019

    • Author(s)
      Yu Ito
    • Organizer
      International Workshop on Stochastic Analysis and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Integration with respect to Hoelder rough paths of order greater than 1/4: an approach via fractional calculus2019

    • Author(s)
      Yu Ito
    • Organizer
      Okayama Workshop on Stochastic Analysis 2019
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] A fractional calculus approach to rough path integration2018

    • Author(s)
      Yu Ito
    • Organizer
      Second Interdisciplinary and Research Alumni Symposium iJaDe2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Integration with respect to Hoelder rough paths of order greater than 1/4: an approach via fractional calculus2018

    • Author(s)
      Yu Ito
    • Organizer
      確率解析とその周辺
    • Related Report
      2018 Research-status Report
  • [Remarks] Yu Ito's home page

    • URL

      http://www.cc.kyoto-su.ac.jp/~k5896/

    • Related Report
      2023 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2025-01-30  

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