Professor Nikolaos Zygouras




Tuesday, May 1, 2007 - 11:00am


MSTB 254

Abstract : We consider a simple random walk on Z
, d > 3. We also consider
a collection of i.i.d. positive and bounded random variables ( V? (x) )x?Z d , which will
serve as a random potential. We study the annealed and quenched cost to perform
long crossings in the random potential ? + ? V? (x), where ? is positive constant
and ? > 0 small enough . These costs are measured by the Lyapounov norms We
prove the equality of the annealed and the quenched norm. We will also discuss the
relation between the Lyapounov norms and the path behavior of the random walk
in the random potential.