On the limiting velocity of random walks in mixing random environment

We consider random walks in strong-mixing random Gibbsian environments in ${\mathbb{Z}}^d,d\ge 2$. Based on regeneration arguments, we will first provide an alternative proof of Rassoul-Agha’s conditional law of large numbers (CLLN) for mixing environment Rassoul-Agha (2005). Then, using coupling techniques, we show that there is at most one nonzero limiting velocity in high dimensions ($d\ge 5$).