broadcast in Room 440, Astro-Math Bldg., NTU, Online seminar

(線上演講 於台大天文數學館440教室直播/收播)

An Application of Random Walk in Random Environment

Yuki Chino (National Yang Ming Chiao Tung University)

Abstract

Stochastic processes in random media have become a hot topic in both mathematics and physics literature. The random walk in random environment (RWRE) is one of the classical models to describe the behavior of some object in a solvent with impurities. The model shows different asymptotic behavior depending on the moment condition for some parameter. The model on one dimensional lattice is solvable, but there remain a lot of open problems for the case in higher dimensions. In this talk, we focus on the results on one dimensional lattice. Solomon showed the law of large numbers for the transient regime. Kesten, Kozlov and Spitzer proved the fluctuations for the transient regime and Sinai and Kesten proved for recurrent regime. The large deviation principle was also proved for both quenched and annealed cases. There are some extensions of the model. The most popular extension is called random walk in dynamical random environment (RWDRE). In the model we reset the environment every unit of time. L. Avena, C. da Costa, F. den Hollander and I considered an intermediate model between RWRE and RWDRE. The model shows a crossover along the choice of how to reset the environment. To be precise, we define a deterministic sequence of times and re-sample the random environment at each time. We will see how and how much the results for RWRE are affected from such modification.

Meeting number (access code): 2517 808 0164

Meeting password: vwSsDVT2N67