FUKUSHIMA Ryoki

Affiliation

Institute of Pure and Applied Sciences

Official title

Professor

ORCID

0000-0002-7582-6793

URL

http://www.math.tsukuba.ac.jp/~ryoki/

Research fields

Basic analysis

Research keywords

Limit theorem
Analysis
Homogenization
Percolation
Large deviation
Random media
Disordered media
Stochastic process
Probability theory
Mathematics

Research projects

不規則媒質中の最速浸透問題の研究 研究課題	2025-04 -- 2030-03	福島竜輝	日本学術振興会/基盤研究(B)	11,960,000Yen
ランダム媒質中の確率過程の定量的研究	2021-04 -- 2024-03		日本学術振興会/基盤研究(C)	2,340,000Yen
Stochastic analysis and applications	2012-01 -- 2014-01	竹田雅好	日本学術振興会/二国間交流事業（日独）	400,000Yen
ランダム媒質における均質化と揺らぎの研究 （平成29年度分）	2017-01 -- 2018-01		Japan Society of for the Promotion of Science/基盤研究(C)	1,430,000Yen
ランダム媒質における均質化と揺らぎの研究 （平成28年度分）	2016-01 -- 2017-01		Japan Society of for the Promotion of Science/基盤研究(C)	1,300,000Yen
ランダム媒質中の確率過程 （平成27年度分）	2015-01 -- 2016-01		Japan Society of for the Promotion of Science/若手研究（Ｂ）	780,000Yen
ランダム媒質中の確率過程	2012-01 -- 2016-01		Japan Society of for the Promotion of Science/若手研究(B)	3,120,000Yen
ランダム媒質中の確率過程 （平成26年度分）	2014-01 -- 2015-01		Japan Society of for the Promotion of Science/若手研究（Ｂ）	780,000Yen
ランダム媒質中の確率過程	2012-01 -- 2015-01		Japan Society of for the Promotion of Science/若手研究（Ｂ）	780,000Yen
ランダム媒質中における局在現象の研究	2010-01 -- 2011-01		Japan Society of for the Promotion of Science/研究活動スタート支援	2,509,000Yen
more...

Degree

2008-07	博士（理学）	京都大学
2007-03	修士（理学）	京都大学

Licenses and qualifications

2020-11	普通自動車免許

Academic societies

2008-04 -- (current)	The Mathematical Society of Japan

Honors & Awards

2024-9	日本数学会解析学賞	ランダム媒質から誘導される複雑な系上の統計力学模型の解析
2016-01	Young Scientists' Prize for Science and Technology by MEXT
2009-01	Inoue Research Award for Young Scientists
2009-01	Takebe Prizes

Articles

• Extremal regime for one-dimensional Mott variable-range hopping
  福島 竜輝; David Croydon; Stefan Junk
  Annales Henri Lebesgue/6/pp.1169-1211, 2023-11
• Anomalous scaling regime for one-dimensional Mott variable-range hopping
  福島 竜輝; David Croydon; Stefan Junk
  The Annals of Applied Probability/33(5)/pp.4044-4090, 2023-10
• Moment characterization of the weak disorder phase for directed polymers in a class of unbounded environments
  Fukushima Ryoki; Junk Stefan
  ELECTRONIC COMMUNICATIONS IN PROBABILITY/28, 2023-04-01
• The period group of a characteristic function
  Fukushima Ryoki; Nakashima Makoto; Yoshida Nobuo
  REAL ANALYSIS EXCHANGE/47(2)/pp.323-332, 2023-02
• Number of paths in oriented percolation as zero temperature limit of directed polymer
  福島 竜輝; Junk Stefan
  PROBABILITY THEORY AND RELATED FIELDS/183(3-4)/pp.1119-1151, 2022-05
• 「確率論とポテンシャル」
  福島 竜輝
  月刊誌「数理科学」, 2022-03
• Note on the maximal jump size in a continuum model of directed first passage percolation
  福島 竜輝
  Advanced Studies in Pure Mathematics/87/pp.213-226, 2022-01
• On large deviation rate functions for a continuous-time directed polymer in weak disorder
  福島 竜輝; Junk Stefan
  Electron. Commun. Probab./26/pp.1-10, 2021-03
• Distribution of the random walk conditioned on survival among quenched Bernoulli obstacles
  福島 竜輝; Ding Jian; Sun Rongfeng; Xu Changji
  Ann. Probab./49/pp.206-243, 2021-01
• Quenched tail estimate for the random walk in random scenery and in random layered conductance II
  Deuschel Jean-Dominique; Fukushima Ryoki
  ELECTRONIC JOURNAL OF PROBABILITY/25(75), 2020-06
• Geometry of the random walk range conditioned on survival among Bernoulli obstacles
  Jian Ding Ryoki Fukushima Rongfeng Sun Changji Xu
  Probability Theory and Related Fields/177/pp.91-145, 2020-06
• Biased Random Walk Conditioned on Survival Among Bernoulli Obstacles: Subcritical Phase
  Jian Ding Ryoki Fukushima Rongfeng Sun Changji Xu
  Communications in Mathematical Physics/376/pp.2161-2195, 2020-06
• New high-dimensional examples of ballistic random walks in random environment
  Ryoki Fukushima Alejandro Ramirez
  RIMS Kokyuroku Bessatsu, B79: Stochastic Analysis on Large Scale Interacting Systems/pp.109-122, 2020-04
• Zero temperature limit for the Brownian directed polymer among Poissonian disasters
  Ryoki Fukushima Stefan Junk
  The Annals of Applied Probability/29/pp.3821-3860, 2019-12
• Quenched tail estimate for the random walk in random scenery and in random layered conductance
  Jean-DominiqueDeuschel Ryoki Fukushima
  Stochastic Process. Appl./129(1)/pp.102-128, 2019-01
• Slowdown estimates for one-dimensional random walks in random environment with holding times
  Amir Dembo; Ryoki Fukushima; Naoki Kubota
  Electron. Commun. Probab./23(89)/pp.1-12, 2018-11
• Eigenvlaue fluctuations for lattice Anderson Hamiltonians: unbounded potentials
  Marek Biskup Ryoki Fukushima Wolfgang Koenig
  Interdiscip. Inform. Sci./24(1)/pp.59-76, 2018-06
• Eigenvalue fluctuations for lattice Anderson Hamiltonians
  Marek Biskup Ryoki Fukushima Wolfgang Koenig
  SIAM J. Math. Anal./48(4)/pp.2674-2700, 2016-01
• Limiting results for the free energy of directed polymers in random environment with unbounded jumps
  Francis Comets Ryoki Fukushima Shuta Nakajima Nobuo Yo...
  J. Stat. Phys./161(3)/pp.577-597, 2015-01
• Quenched large deviations for multidimensional random walk in random environment with holding times
  Ryoki Fukushima Naoki Kubota
  J. Theoret. Probab./27(4)/pp.1140-1166, 2014-01
• Annealed Brownian motion in a heavy tailed Poissonian potential
  Ryoki Fukushima
  Ann. Probab./41(5)/pp.3462-3493, 2013-01
• On exponential growth for a certain class of linear systems
  Ryoki Fukushima Nobuo Yoshida
  ALEA Lat. Am. J. Probab. Math. Stat./9(2)/pp.323-336, 2012-01
• Second order asymptotics for Brownian motion in a heavy tailed Poissonian potential
  Ryoki Fukushima
  Markov Process. Related Fields/17(3)/pp.447-482, 2011-10
• Moment asymptotics for the parabolic Anderson problem with a perturbed lattice potential
  Ryoki Fukushima Naomasa Ueki
  J. Funct. Anal./260(3)/pp.724-744, 2011-02
• Classical and quantum behavior of the integrated density of states for a randomly perturbed lattice
  Ryoki Fukushima Naomasa Ueki
  Ann. Henri Poincaré/11(6)/pp.1053-1083, 2010-11
• more...

Books

• 授業では教えてくれない微積分学
  福島 竜輝
  森北出版, 2024-11
• 第Ⅱ部第11.2節
  福島 竜輝
  確率論ハンドブック/丸善出版, 2012-07
• 「ランダム作用素」
  福島 竜輝
  月刊誌「数理科学」/サイエンス社, 2016-06

Conference, etc.

• Leading term of maximal edge traversal time in first passage percolation with Weibull distribution
  FUKUSHIMA Ryoki
  Third China-Japan-Korea Joint Probability Workshop/2025-05-08
• Leading term of maximal edge traversal time in first passage percolation with Weibull distribution
  FUKUSHIMA Ryoki
  NYUSH-Peking-Westlake probability conference/2025-04-10
• Leading term of maximal edge traversal time in first passage percolation with Weibull distribution
  FUKUSHIMA Ryoki
  Tsinghua-Tokyo Workshop on PDEs and Probability/2025-03-22
• ランダムな障害物を避けるランダムウォーク
  福島 竜輝
  日本数学会2025年度年会，解析学賞受賞特別講演/2025-03-18
• Number of paths in oriented percolation as zero temperature limit of directed polymer
  福島 竜輝
  LA Probability Forum/2025-03-06
• Sub-diffusive scaling regime for one-dimensional Mott Variable-Range Hopping
  福島 竜輝
  Random Operators and Related Topics 2024/2024-11-16
• Maximal edge traversal time in first passage percolation
  福島 竜輝
  Recent development in KPZ universality/2024-09-24
• Sub-diffusive scaling regime for one-dimensional Mott variable range hopping
  FUKUSHIMA Ryoki
  Homogenization in PDE and stochastic processes/2024-08-20
• Distribution of the random walk conditioned on survival among quenched Bernoulli obstacles
  福島 竜輝
  Random walks, scaling limits and criticality/2024-05-20
• Subdiffusive scaling regime for one-dimensional Mott Variable-Range Hopping
  福島 竜輝
  Interacting particle systems and SPDEs, China-Japan Probability Workshop at BIMSA and YMSC/2024-03-24
• Number of paths in oriented percolation as Ryoki Fukushima zero temperature limit of directed polymer
  福島 竜輝
  Random Interacting Systems, Scaling Limits, and Universality/2023-12-04
• Distribution of the random walk conditioned on survival among quenched Bernoulli obstacles
  福島 竜輝
  Random Operators and Related Topics/2023-10-14
• Concentration inequalities in random media
  福島 竜輝
  Mathematics of Random Systems Summer School/2023-09-11--2023-09-15
• Recent results on RW among random obstacles
  福島 竜輝
  Stochastic Processes and Related Fields/2023-09-04
• Distribution of the random walk conditioned on survival among quenched Bernoulli obstacles
  福島 竜輝
  Workshop on Probabilistic Methods in Statistical Mechanics of Random Media and Random Fields 2023/2023-01-09--2023-01-13
• Number of paths in oriented percolation as zero temperature limit of directed polymer
  福島 竜輝
  Open German-Japanese conference on stochastic analysis and applications/2022-09-19--2022-09-23
• Zero temperature limits of directed polymers in random environment
  Fukushima Ryoki
  Workshop on Probabilistic Methods in Statistical Mechanics of Random Media and Random Fields 2022/2022-01-11--2022-01-14
• Zero temperature limits of directed polymers in random environment
  福島 竜輝
  Workshop on Probabilistic Methods in Statistical Mechanics of Random Media and Random Fields 2022/2022-01-11--2022-01-14
• Biased random walk conditioned on survival among Bernoulli obstacles
  福島 竜輝
  Stochastic Analysis on Large Scale Interacting Systems/2021-12-07--2021-12-09
• Number of paths in oriented percolation as zero temperature limit of directed polymer
  福島 竜輝
  The 10th International Conference on Stochastic Analysis and its Applications/2021-09-06--2021-09-10
• Biased random walk conditioned on survival among Bernoulli obstacles: subcritical phase
  福島 竜輝
  日本数学会年会/2021-03-15
• Geometry of the random walk range conditioned on survival among Bernoulli obstacles
  福島 竜輝
  日本数学会年会/2021-03-15
• Quenched tail estimate for the random walk in random scenery II
  福島 竜輝
  日本数学会年会/2021-03-15
• Biased random walk conditioned on survival among Bernoulli obstacles: sub-critical phase
  福島竜輝
  Spectra of Random Operators and Related Topics/2020-01-01
• Random walk conditioned on survival among Bernoulli obstacles
  福島竜輝
  台湾数学会年会/2019-12-01
• more...

Teaching

2024-04 -- 2024-08	Research in Analysis IIB	University of Tsukuba.
2024-04 -- 2024-08	Research in Analysis IB	University of Tsukuba.
2024-04 -- 2024-08	Research in Analysis IVB	University of Tsukuba.
2024-04 -- 2024-08	Research in Analysis IVA	University of Tsukuba.
2024-10 -- 2025-02	Research in Analysis VB	University of Tsukuba.
2024-10 -- 2025-02	Research in Analysis IA	University of Tsukuba.
2024-04 -- 2024-08	Research in Analysis VA	University of Tsukuba.
2024-10 -- 2025-02	Research in Analysis VA	University of Tsukuba.
2024-10 -- 2025-02	Research in Analysis IIA	University of Tsukuba.
2024-04 -- 2024-08	Seminar on Mathematics	University of Tsukuba.
more...

Other educational activities

2022-08 -- 2022-08	筑波大学数学類体験学習	筑波大学数学類
2022-10 -- 2022-10	早稲田大学 SGU 特別講義「ランダム媒質中の確率過程」	早稲田大学

Professional activities

2020-01 -- 2023-12	Bernoulli Society for Mathematical Statistics and Probability	East Asian and Pacific Regional Committee
2020-01 -- 2025-12	Bernoulli Society for Mathematical Statistics and Probability	Committee for Conferences on Stochastic Processes
2020-03 -- 2022-02	The Mathematical Society of Japan	統計数学分科会運営委員

University Management

2024-04 -- 2025-03	ダイバーシティ・アクセシビリティ担当教員
2020-04 -- 2021-03	障害学生支援に係るダイバーシティ・アクセシビリティ担当教員

(Last updated: 2025-07-23)