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Holmes, Mark; Salisbury, Thomas S.
 Random Walks in Degenerate Random Environments We study the asymptotic behaviour of random walks in i.i.d. random environments on \$\mathbb{Z}^d\$. The environments need not be elliptic, so some steps may not be available to the random walker. We prove a monotonicity result for the velocity (when it exists) for any 2-valued environment, and show that this does not hold for 3-valued environments without additional assumptions. We give a proof of directional transience and the existence of positive speeds under strong, but non-trivial conditions on the distribution of the environment. Our results include generalisations (to the non-elliptic setting) of 0-1 laws for directional transience, and in 2-dimensions the existence of a deterministic limiting velocity. Keywords:random walk, non-elliptic random environment, zero-one law, couplingCategory:60K37

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