Updated on 2026/04/28

写真a

 
HOSHINO MASATO
 
Organization
School of Science Associate Professor
Title
Associate Professor
External link

Research Interests

  • probability theory

  • paracontrolled calculus

  • regularity structure

  • rough path theory

  • stochastic partial differential equations

Research Areas

  • Natural Science / Basic analysis

Education

  • The University of Tokyo   Graduate School of Mathematical Sciences

    2014.4 - 2017.3

      More details

Research History

  • Institute of Science Tokyo   Department of Mathematics   Associate Professor

    2025.4

      More details

  • Osaka University   Graduate School of Engineering Science   Associate Professor

    2021.4 - 2025.3

      More details

  • Kyushu University   Faculty of Mathematics   Assistant Professor

    2018.4 - 2021.3

      More details

Papers

  • A semigroup approach to the reconstruction theorem and the multilevel Schauder estimate Reviewed

    Masato Hoshino

    Annales Henri Lebesgue   8   151 - 180   2025.5

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Cellule MathDoc/Centre Mersenne  

    The reconstruction theorem and the multilevel Schauder estimate have central roles in the analytic theory of regularity structures by Hairer (2014). Inspired by Otto and Weber’s work (2019), we provide elementary proofs for them by using the semigroup of operators. Essentially, we use only the semigroup property and the upper estimates of kernels. Moreover, we refine the several types of Besov reconstruction theorems considered by Hairer–Labbé (2017) and Broux–Lee (2022) and introduce the new framework of “regularity-integrability structures”. The analytic theorems in this paper are applied to the study of quasilinear SPDEs by Bailleul–Hoshino–Kusuoka (2022+) and an inductive proof of the convergence of random models by Bailleul–Hoshino (2023+).

    DOI: 10.5802/ahl.232

    researchmap

  • Regularity Structures for Quasilinear Singular SPDEs Reviewed

    I. Bailleul, M. Hoshino, S. Kusuoka

    Archive for Rational Mechanics and Analysis   248 ( 6 )   2024.11

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00205-024-02069-6

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s00205-024-02069-6/fulltext.html

  • Stochastic quantization associated with the $$\exp (\Phi )_2$$-quantum field model driven by space-time white noise on the torus in the full $$L^1$$-regime Reviewed

    Masato Hoshino, Hiroshi Kawabi, Seiichiro Kusuoka

    Probability Theory and Related Fields   185 ( 1-2 )   391 - 447   2022.5

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The present paper is a continuation of our previous work (Hoshino et al., J Evol Equ 21:339–375, 2021) on the stochastic quantization of the $$\exp (\Phi )_2$$-quantum field model on the two-dimensional torus. Making use of key properties of Gaussian multiplicative chaos and refining the method for singular SPDEs introduced in the previous work, we construct a unique time-global solution to the corresponding parabolic stochastic quantization equation in the full “$$L^{1}$$-regime” $$\vert \alpha \vert <\sqrt{8\pi }$$ of the charge parameter $$\alpha $$. We also identify the solution with an infinite-dimensional diffusion process constructed by the Dirichlet form approach.

    DOI: 10.1007/s00440-022-01126-z

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s00440-022-01126-z/fulltext.html

  • Paracontrolled calculus and regularity structures II Reviewed

    Ismael Bailleul, Masato Hoshino

    Journal de l’École polytechnique — Mathématiques   8   1275 - 1328   2021.7

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Cellule MathDoc/CEDRAM  

    DOI: 10.5802/jep.172

    researchmap

  • Stochastic quantization associated with the $$\exp (\Phi )_2$$-quantum field model driven by space-time white noise on the torus Reviewed

    Masato Hoshino, Hiroshi Kawabi, Seiichiro Kusuoka

    Journal of Evolution Equations   21 ( 1 )   339 - 375   2021.3

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00028-020-00583-0

    Scopus

    researchmap

    Other Link: http://link.springer.com/article/10.1007/s00028-020-00583-0/fulltext.html

  • Paracontrolled calculus and regularity structures I Reviewed

    Ismael BAILLEUL, Masato HOSHINO

    Journal of the Mathematical Society of Japan   2020.11

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Mathematical Society of Japan (Project Euclid)  

    DOI: 10.2969/jmsj/81878187

    researchmap

  • Global well-posedness of complex Ginzburg–Landau equation with a space–time white noise Reviewed

    Masato Hoshino

    Annales de l'Institut Henri Poincaré, Probabilités et Statistiques   54 ( 4 )   1969 - 2001   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    researchmap

  • A coupled KPZ equation, its two types of approximations and existence of global solutions Reviewed

    Tadahisa Funaki, Masato Hoshino

    JOURNAL OF FUNCTIONAL ANALYSIS   273 ( 3 )   1165 - 1204   2017.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jfa.2017.05.002

    Web of Science

    researchmap

  • A semigroup approach to the reconstruction theorem and the multilevel Schauder estimate for singular modelled distributions Reviewed

    Masato Hoshino, Ryoji Takano

    Stochastics and Partial Differential Equations: Analysis and Computations   2025.3

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s40072-025-00352-5

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s40072-025-00352-5/fulltext.html

  • A tourist’s guide to regularity structures and singular stochastic PDEs Reviewed

    Ismaël Bailleul, Masato Hoshino

    EMS Surveys in Mathematical Sciences   2025.1

     More details

    Publishing type:Research paper (scientific journal)   Publisher:European Mathematical Society - EMS - Publishing House GmbH  

    We give an essentially self-contained treatment of the fundamental analytic and algebraic features of regularity structures and their applications to the study of singular stochastic PDEs.

    DOI: 10.4171/emss/87

    researchmap

  • A note on the Taylor estimates of iterated para products Reviewed

    Masato Hoshino

    RIMS Kôkyûroku Bessatsu   B95   2024

     More details

  • Non relativistic and ultra relativistic limits in 2D stochastic nonlinear damped Klein–Gordon equation Reviewed

    Reika Fukuizumi, Masato Hoshino, Takahisa Inui

    Nonlinearity   35 ( 6 )   2878 - 2919   2022.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    We study the non relativistic and ultra relativistic limits in the two-dimensional nonlinear damped Klein–Gordon equation driven by a space-time white noise on the torus. In order to take the limits, it is crucial to clarify the parameter dependence in the estimates of solution. In this paper we present two methods to confirm this parameter dependence. One is the classical, simple energy method. Another is the method via Strichartz estimates.

    DOI: 10.1088/1361-6544/ac64e0

    researchmap

    Other Link: https://iopscience.iop.org/article/10.1088/1361-6544/ac64e0/pdf

  • Asymptotics of PDE in random environment by paracontrolled calculus Reviewed

    Tadahisa Funaki, Masato Hoshino, Sunder Sethuraman, Bin Xie

    Annales de l'Institut Henri Poincaré, Probabilités et Statistiques   57 ( 3 )   1702 - 1735   2021.7

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Institute of Mathematical Statistics  

    DOI: 10.1214/20-aihp1129

    researchmap

  • Iterated paraproducts and iterated commutator estimates in Besov spaces Reviewed

    Masato Hoshino

    Stochastic Analysis, Random Fields and Integrable Probability — Fukuoka 2019   2021.1

     More details

    Publishing type:Part of collection (book)   Publisher:SPIE  

    DOI: 10.2969/aspm/08710239

    researchmap

  • Tightness of the solutions to approximating equations of the stochastic quantization equation associated with the weighted exponential quantum field model on the two-dimensional torus Reviewed

    Masato Hoshino, Hiroshi Kawabi, Seiichiro Kusuoka

    Stochastic Analysis, Random Fields and Integrable Probability — Fukuoka 2019   2021.1

     More details

    Publishing type:Part of collection (book)   Publisher:SPIE  

    DOI: 10.2969/aspm/08710341

    researchmap

  • Commutator estimates from a viewpoint of regularity structures Reviewed

    Masato Hoshino

    RIMS Kôkyûroku Bessatsu   B79   179 - 197   2020.4

     More details

  • Paracontrolled calculus and Funaki–Quastel approximation for the KPZ equation Reviewed

    Masato Hoshino

    Stochastic Processes and their Applications   128 ( 4 )   1238 - 1293   2018.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    DOI: 10.1016/j.spa.2017.07.001

    Scopus

    researchmap

  • Stochastic complex Ginzburg-Landau equation with space-time white noise Reviewed

    Masato Hoshino, Yuzuru Inahama, Nobuaki Naganuma

    ELECTRONIC JOURNAL OF PROBABILITY   22 ( 104 )   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1214/17-EJP125

    Web of Science

    researchmap

  • KPZ equation with fractional derivatives of white noise Reviewed

    Masato Hoshino

    Stochastics and Partial Differential Equations: Analysis and Computations   4 ( 4 )   827 - 890   2016.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    researchmap

▼display all

MISC

Presentations

  • KPZ equation with fractional derivatives of white noise International conference

    Masato Hoshino

    2015.10 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • KPZ equation with fractional derivatives of white noise International conference

    Masato Hoshino

    Stochastic Analysis on Large Scale Interacting Systems  2014.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Global well-posedness of CGL equation with space-time white noise International conference

    Masato Hoshino

    Berlin-Oxford meeting  2017.5 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • (1) Hairer理論の$\Phi^4$モデルへのアプローチの概説, (2) Global well-posedness of singular stochastic PDEs Invited

    星野壮登

    確率解析とその周辺  2016.11 

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • Coupled KPZ equations International conference

    Masato Hoshino

    Stochastic Analysis on Large Scale Interacting Systems  2016.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Global well-posedness of comples Ginzburg-Landau equation with a space-time white noise Invited International conference

    Masato Hoshino

    Stochastic Analysis on Large Scale Interacting Systems  2017.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • A relation between modeled distributions and paracontrolled distributions International conference

    Masato Hoshino

    2017.10 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • (1) Global well-posedness of complex Ginzburg-Landau equation with a space-time white noise, (2) A coupled KPZ equation, its two types of approximations and existence of global solutions

    Masato Hoshino

    2017.9 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • Global solution of the coupled KPZ equation Invited International conference

    Masato Hoshino

    Japanese-German Open Conference on Stochastic Analysis  2017.9 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • A relation between regularity structures and paracontrolled calculus

    Masato Hoshino

    Stochastic Analysis on Large Scale Interacting Systems  2018.11 

     More details

  • A relation between regularity structures and paracontrolled calculus Invited

    Masato Hoshino

    2018.9 

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • A relation between modeled distributions and paracontrolled distributions Invited International conference

    Masato Hoshino

    The AIMS Conference Series on Dynamical Systems and Differential Equations  2018.7 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Global solutions of some singular SPDEs Invited International conference

    Masato Hoshino

    Tokyo-Seoul Conference in Mathematics –Probability Theory-  2017.12 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Global solutions of some singular SPDEs: the coupled Kardar-Parisi-Zhang equation and the complex Ginzburg-Landau equation

    Masato Hoshino

    2018.12 

     More details

  • Local estimates of iterated paraproducts

    Masato Hoshino

    2018.11 

     More details

  • Recovering modelled distributions from paracontrolled calculus

    Masato Hoshino

    2018.12 

     More details

  • Paracontrolled Calculus and Regularity Structures Invited

    Masato Hoshino

    The 12th Mathematical Society of Japan, Seasonal Institute (MSJ-SI)  2019.7 

     More details

  • A relation between modelled distributions and paracontrolled distributions Invited

    Masato Hoshino

    Equadiff 2019  2019.7 

     More details

  • Coupled KPZ equations Invited

    Masato Hoshino

    2019 IMS-China International Conference on Statistics and Probability  2019.7 

     More details

  • A relation between paracontrolled calculus and regularity structures

    Masato Hoshino

    Okayama Workshop on Stochastic Analysis 2019  2019.2 

     More details

  • Iterated paraproducts and commutator estimates from a viewpoint of regularity structures Invited

    星野壮登

    第37回九州における偏微分方程式研究集会  2020.1 

     More details

  • Paracontrolled calculus and regularity structures

    星野壮登

    確率論シンポジウム  2019.12 

     More details

  • Paracontrolled calculus and regularity structures

    星野壮登

    確率解析とその周辺  2019.11 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    Japanese-German Open Conference on Stochastic Analysis 2019  2019.7 

     More details

  • Commutator estimates from a viewpoint of regularity structures

    星野壮登

    確率解析とその周辺  2020.11 

     More details

  • Stochastic quantization associated with the two dimensional exp(ϕ)-quantum field mode Invited

    星野壮登

    量子渦と非線形波動  2021.2 

     More details

  • Stochastic quantization associated with the exp(αϕ)2-quantum field model

    星野壮登

    確率論シンポジウム  2020.12 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    The 10th International Conference on Stochastic Analysis and its Applications  2021.9 

     More details

  • Singular stochastic PDEs and regularity structures Invited

    星野壮登

    調和解析と非線形偏微分方程式  2021.7 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    CIRM conference "Pathwise Stochastic Analysis and Applications"  2021.3 

     More details

  • Stochastic quantization associated with the exp(αϕ)2-quantum field model Invited

    星野壮登

    量子場の数理とその周辺  2021.3 

     More details

  • Paracontrolled calculus and regularity structures

    Masato Hoshino

    Quasi-linear PDEs in fluids II  2022.2 

     More details

  • Non relativistic and ultra relativistic limits in 2d stochastic nonlinear damped Klein-Gordon equation

    星野壮登

    大規模相互作用系の確率解析  2021.12 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    Higher Structures Emerging from Renormalisation (ESI workshop)  2021.11 

     More details

  • Non relativistic and ultra relativistic limits in 2d stochastic nonlinear damped Klein-Gordon equation

    星野壮登

    確率解析とその周辺  2021.11 

     More details

  • A semigroup approach to the multi-level Schauder estimate

    Masato Hoshino

    Probability and Analysis on Random Structures and Related Topics  2022.8 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    Harmonic Analysis, Stochastics and PDEs in Honour of the 80th Birthday of Nicolai Krylov  2022.6 

     More details

  • Paracontrolled calculus and regularity structures Invited

    Masato Hoshino

    Deterministic Dynamics and Randomness in PDE  2022.5 

     More details

  • A regularity structure for the quasilinear generalized KPZ equation Invited

    Masato Hoshino

    Stochastic and nonlinear partial differential equations  2022.12 

     More details

  • A regularity structure for the quasilinear generalized KPZ equation

    星野壮登

    確率解析とその周辺  2022.12 

     More details

  • Stochastic quantization associated with the exp(αϕ)2-quantum field model Invited

    Masato Hoshino

    Open Japanese-German conference on stochastic analysis and applications  2022.9 

     More details

  • A regularity structure for the quasilinear generalized KPZ equation Invited

    Masato Hoshino

    Geometry, Stochastics & Dynamics  2022.9 

     More details

  • A regularity structure for the quasilinear generalized KPZ equation

    星野壮登

    確率論シンポジウム  2022.12 

     More details

▼display all

Awards

  • 建部賢弘奨励賞

    2017.9   日本数学会   非適切な確率偏微分方程式の研究

    星野壮登

     More details

  • 東京大学総長賞

    2016.3   東京大学   Hairer理論の適用限界に関する研究

    星野壮登

     More details

Research Projects

  • 非線形分散型及び波動方程式における特異なランダム動力学

    Grant number:23K25776  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    福泉 麗佳, 星野 壮登, 前田 昌也, 岡本 葵

      More details

    Grant amount:\15990000 ( Direct Cost: \12300000 、 Indirect Cost:\3690000 )

    非線形確率偏微分方程式を考える上で問題となるのが, 多くの場合超関数となる未知関数に対して, その非線形項をどう定義するかである. Hairerの正則性構造理論では未知関数を「既知のノイズ超汎関数を基底とするTaylor展開」として記述し, 元の方程式をTaylor展開が満たす方程式に持ち上げて考える. 本年度星野は, この持ち上げ方程式の適切性を, 元の方程式の主要部の微分作用素から生成される作用素半群を用いて示し, 従来のものより簡単な証明を得ることに成功した. 分担者前田は, 非線形シュレディンガー方程式のソリトンの周りの解について, ソリトンがインターナルモードと呼ばれる中立固有値を持ちかつ線形不安定な場合についてその挙動を調べた. 具体的にはソリトン周りに多様体を構成しその多様体の元を初期値にもつ解はソリトンの近くにとどまり続けなおかつソリトンと散乱波に分解されることを示した. 岡本は, 確率非線形波動方程式について研究を行った. 乗法的ノイズをもつ場合, 確率非線形熱方程式では局所的には線形解で近似されるという局所線形化が起こる. 一方, 確率非線形波動方程式では確率非線形熱方程式と同じような局所線形化は成立しないことが知られている. そこで確率非線形波動方程式がもつ局所的な変動について考察した. 福泉は非線形シュレディンガー方程式に時空ノイズを加えた方程式の可解性について, どのくらいのノイズの正則性で一次元2次の非線形項が扱えるようになるかを調べた.

    researchmap

  • 非線形分散型及び波動方程式における特異なランダム動力学

    Grant number:23H01079  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    福泉 麗佳, 星野 壮登, 前田 昌也, 岡本 葵

      More details

    Grant amount:\15990000 ( Direct Cost: \12300000 、 Indirect Cost:\3690000 )

    researchmap

  • 繰り込みを伴う確率偏微分方程式の新展開

    Grant number:23K12987  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  若手研究

    星野 壮登

      More details

    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

    researchmap

  • 幾何解析の視点を融合した無限次元空間上の確率解析の新展開

    Grant number:23K03155  2023.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    河備 浩司, 石渡 聡, 楠岡 誠一郎, 難波 隆弥, 星野 壮登

      More details

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    researchmap

  • Equations with renormalization and stochastic analysis

    Grant number:23K20801  2021.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

      More details

    Grant amount:\16900000 ( Direct Cost: \13000000 、 Indirect Cost:\3900000 )

    researchmap

  • Equations with renormalization and stochastic analysis

    Grant number:21H00988  2021.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

      More details

    Grant amount:\16900000 ( Direct Cost: \13000000 、 Indirect Cost:\3900000 )

    researchmap

  • New developments in stochastic analysis

    Grant number:23K20216  2020.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

      More details

    Grant amount:\14690000 ( Direct Cost: \11300000 、 Indirect Cost:\3390000 )

    researchmap

  • New developments in stochastic analysis

    Grant number:20H01807  2020.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

      More details

    Grant amount:\14690000 ( Direct Cost: \11300000 、 Indirect Cost:\3390000 )

    researchmap

  • Stochastic Analysis on Infinite Dimensional Spaces from a Geometric View

    Grant number:20K03639  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

      More details

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    researchmap

  • 量子流体力学に現れる確率偏微分方程式の研究

    Grant number:19KK0066  2019.10 - 2023.3

    日本学術振興会  科学研究費助成事業 国際共同研究加速基金(国際共同研究強化(B))  国際共同研究加速基金(国際共同研究強化(B))

    福泉 麗佳, 星野 壮登, 前田 昌也, 小林 未知数, 戍亥 隆恭

      More details

    Grant amount:\9750000 ( Direct Cost: \7500000 、 Indirect Cost:\2250000 )

    昨年度に引き続き、新型コロナウイルスの影響により共同研究相手国であるフランスへの渡航は実現できなかった。一方で、世界的にテレワーク手段が発達したため、時差や通信障害などの問題はあるもののオンラインでの議論を行うことにより当初の研究計画に促した以下の成果を得ている。研究代表者は、A.de BouardとA.Debusscheと共同研究で温度効果を考慮した Bose-Einstein 凝縮モデルの空間2次元における正当化について論文の執筆を完成し現在査読審査中である。温度効果は散逸項とホワイトノイズを絶対零度の場合のモデル方程式に加えることで表現を行うが、散逸効果が大きいときに確率的な意味での強解を得ることに成功した。調和ポテンシャルを伴うシュレディンガー作用素に対するWick積を考えたところが新しい。散逸効果が小さい場合にはマルチンゲール解と呼ばれる弱い解しか得られず、今後引き続き改善を必要とする課題である。また、研究分担者星野と戌亥、研究代表者は消散項つき確率波動方程式の非相対論的極限を正当化することに成功し現在論文執筆中である。 また、研究分担者である小林は、 I.Danaila、L.Danailaらと共同研究を実施し、 量子乱流を数値的に扱う複数のアルゴリズムおよびGross-Pitaevskii方程式を高速で解くための複数のアルゴリズムを議論した。 様々な状況下における量子乱流シミューションの数値計算効率を比較し、成果をまとめた論文「Quantum turbulence simulations using the Gross-Pitaevskii equation: High-Performance computing and new numerical benchmarks」を Computer Physics Communications に発表した。

    researchmap

  • 繰り込みを伴う非線形確率偏微分方程式の解析に対する一般理論

    Grant number:19K14556  2019.4 - 2023.3

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    星野 壮登

      More details

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    昨年度に引き続き,具体的な確率偏微分方程式の解析と,確率偏微分方程式の繰り込みの一般理論を研究した.
    1.昨年度に引き続き,Hoegh-Krohnモデルに付随する確率偏微分方程式を研究した.昨年度は方程式のパラメータが"L^2領域"(Gauss乗法カオスがL^2に含まれる範囲)にある場合の解析を行なったが,今年度はより広い"L^1領域"(Gauss乗法カオスが,あるp>1についてL^pに含まれる範囲)で時間大域的可解性などを示すことができた.(河備浩司氏(慶應義塾大学),楠岡誠一郎氏(京都大学)との共同研究)
    2.正則構造理論により一般の確率偏微分方程式の繰り込みが可能になったが,その理論は4つの論文から成っており,合計で500ページ以上に及ぶため,学習が困難であった.そこで今年度は理論を要約する論文をIsmael Bailleul氏(Universite de Rennes 1)と共同で執筆した.抽象的な概念に説明を加えたり,いくつかの定理に別証明を与えるなどの工夫によって,比較的分かりやすくコンパクトにまとめることができた.
    3.摩擦項を持つ非線形確率波動方程式を研究し,初期値をGibbs測度の下で抽出した場合の時間大域的可解性を示すことができた.(福泉麗佳氏(東北大学),戌亥隆恭氏(大阪大学)との共同研究)

    researchmap

  • 特異な確率偏微分方程式に対する近似理論の正則性構造理論による研究

    Grant number:16J03010  2016.4 - 2018.3

    日本学術振興会  特別研究員奨励費  特別研究員奨励費

    星野壮登

      More details

    Authorship:Principal investigator  Grant type:Competitive

    前年度に引き続き,時空ホワイトノイズによって駆動される3次元複素Ginzburg-Landau方程式の時間大域的適切性についての研究を完成させ,論文"Global well-posedness of complex Ginzburg-Landau equation with space-time white noise"にまとめた.
    また正則性構造理論やパラコントロール解析自体に手を加え,その応用範囲を広げるという目標を持って研究を行なった.特異な確率偏微分方程式の繰り込みに関する理論にはHairer氏の正則性構造理論とGubinelli氏,Imkeller氏,Perkowski氏のパラコントロール解析があるが,それぞれに長所と短所がある.正則性構造理論は繰り込み計算を高度な代数構造に昇華している一方,新しい概念が多く,理論展開は複雑である.パラコントロール解析では代数的な考察は進んでいないが,既存の実解析の道具を使えるという利点がある.現在はどちらの理論もトーラス上で展開されているが,より複雑な問題を扱うにはいまの理論自体に手を加える必要がある.そのため,まずはトーラス上で二つの理論が完全に同値であることを示すことにより,両者の長所を組み合わせた新しい理論を展開しようとした.今年度は以下の考察を得た.
    1.与えられた確率偏微分方程式に対し,正則性理論の意味での解はパラコントロール解析を使って書き直すことができる.この時いくつかの係数は不要となり,情報が簡略化される.
    2.パラコントロール解析の意味での解を正則性構造理論で書き直すには,代数的な条件を課す必要があると思われるが,解決には至っておらず,現在も研究を進めている.

    researchmap

▼display all