Probability Seminar
Thursday, February 12, 2009, 4:15pm, 119 Physics
Firas Rassoul-Agha (University of Utah)
On the almost-sure invariance principle for random walk in random environment
Abstract:- Consider a crystal formed of two types of atoms placed at the nodes of the
integer lattice. The type of each atom is chosen at random, but the crystal
is statistically shift-invariant. Consider next an electron hopping from atom
to atom. This electron performs a random walk on the integer lattice with
randomly chosen transition probabilities (since the configuration seen by
the electron is different at each lattice site). This process is highly
non-Markovian, due to the interaction between the walk and the
environment.
We will present a martingale approach to proving the invariance principle
(i.e. Gaussian fluctuations from the mean) for (irreversible) Markov chains
and show how this can be transferred to a result for the above process
(called random walk in random environment).
This is joint work with Timo Sepp\"al\"ainen. [video]
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