Wei-Min Wang
Mean field bounds on Lyapunov exponents in $Z^d$ at the critical 
energy
(124K, dvi file)

ABSTRACT.  We further develop the supersymmetric formalism initiated in [W1] (see also 
[SjW]). We obtain the optimal mean field bounds at the critical energy for Lyapunov 
exponents of random walks in random potentials in $Z^d$ at weak disorder. 
This extends some of the results in [W1].