Lyapunov exponents of Green's functions for random potentials tending to zero

Details Lyapunov exponents of Green's functions for random potentials tending to zero Lyapunov exponents of Green's functions for random potentials tending to zero

2009-03-28

arxiv.org/abs/0903.4928v2

Mathematics

Probability

16 pages, 3 figures. 1 figure added, very minor corrections. To appear in Probability Theory and Related Fields. The final pub

Scientific paper

10.1007/s00440-010-0266-y

We consider quenched and annealed Lyapunov exponents for the Green's function of $-\Delta+\gamma V$, where the potentials $V(x), x\in\Z^d$, are i.i.d. nonnegative random variables and $\gamma>0$ is a scalar. We present a probabilistic proof that both Lyapunov exponents scale like $c\sqrt{\gamma}$ as $\gamma$ tends to 0. Here the constant $c$ is the same for the quenched as for the annealed exponent and is computed explicitly. This improves results obtained previously by Wei-Min Wang. We also consider other ways to send the potential to zero than multiplying it by a small number.

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