Ryoki Fukushima

J-GLOBAL         Last updated: Nov 17, 2019 at 22:35
Ryoki Fukushima
Kyoto University
Research Institute for Mathematical Sciences
Research funding number

Awards & Honors

Young Scientists' Prize for Science and Technology by MEXT, Ministry of Education, Culture, Sports, Science and Technology
Inoue Research Award for Young Scientists, Inoue Research Award for Young Scientist
Takebe Prizes, The Mathematical Society of Japan

Published Papers

Ryoki Fukushima, Alejandro Ramirez
RIMS Kokyuroku Bessatsu, accepted      2020   [Refereed]
We give new criteria for ballistic behavior of random walks in random environment which are perturbations of the simple symmetric random walk on Tex in dimensions Tex. Our results extend those of Sznitman [Ann. Probab. 31, no. 1, 28...
Jian Ding, Ryoki Fukushima, Rongfeng Sun, Changji Xu
Probability Theory and Related Fields      Sep 2019   [Refereed]
Jian Ding, Ryoki Fukushima, Rongfeng Sun, Changji Xu
Communications in Mathematical Physics, accepted      Apr 2019   [Refereed]
We consider a discrete time biased random walk conditioned to avoid Bernoulli obstacles on Tex (Tex) up to time Tex. This model is known to undergo a phase transition: for a large bias, the walk is ballistic whereas for a small b...
Jean-DominiqueDeuschel, Ryoki Fukushima
Stochastic Processes and their Applications   129(1) 102-128   Jan 2019   [Refereed]
Ryoki Fukushima, Stefan Junk
Annals of Applied Probability, accepted      2019   [Refereed]
We study a continuum model of directed polymer in random environment. The law of the polymer is defined as the Brownian motion conditioned to survive among space-time Poissonian disasters. This model is well-studied in the positive temperature reg...

Conference Activities & Talks

Random Walks among Bernoulli obstacles [Invited]
Ryoki Fukushima
CIRM Workshop "Self-interacting Random Walks, Polymers and Folding"   9 Sep 2019   
Tail estimate for random walk in random scenery [Invited]
Ryoki Fukushima
German–Japanese Open Conference on Stochastic Analysis   2 Sep 2019   
Zero Temperature Limits for Directed Polymers in Random Environment [Invited]
Ryoki Fukushima
The 12th MSJ-SI, Stochastic Analysis, Random Fields and Integrable Probability   9 Aug 2019   
Annealed random walk among Bernoulli obstacles [Invited]
Ryoki Fukushima
Probabilistic Methods in Statistical Mechanics of Random Media and Random Fields   27 May 2019   
Geometry of the random walk range conditioned on survival among Bernoulli obstacles [Invited]
Ryoki Fukushima
Stochastic Processes and Related Topics   21 Feb 2019   

Research Grants & Projects

Stochastic analysis and applications
日本学術振興会: 二国間交流事業(日独)
Project Year: 2012 - 2014    Investigator(s): 竹田雅好