# Friday, June 22, 2018 - 14:15 in U2-135

Astral diffusion as a limit process for symmetric random walk in a high contrast periodic medium

A talk in the Oberseminar Analysis series by
Elena Zhizhina from Moskau

 Abstract: The asymptotic properties of a symmetric random walk in a high contrast periodic medium on the lattice are considered. We show that under proper diffusive scaling the random walk exhibits a non-standard limit behaviour. In addition to the coordinate of the random walk in $\mathbb Z^d$ we introduce an extra variable that characterizes the position of the random walk in the period and show that this two-component process converges in law to a limit Markov process. The components of the limit process are mutually coupled, thus we cannot expect that the limit behaviour of the coordinate process is Markov. (This is a joint work with Andrey Piatnitski) Within the CRC this talk is associated to the project(s): A2

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