ON THE AUTOMORPHISM GROUPS OF MULTIDIMENSIONAL SHIFTS OF FINITE TYPE

Abstract. We investigate algebraic properties of the automorphism group of mul-tidimensional shifts of finite type (SFTs). We show that positive entropy implies that the automorphism group contains every finite group, and together with tran-sitivity implies that the center of the automorphism group is trivial (i.e. consists only of the shift action). We also show that positive entropy and dense minimal points (in particular, dense periodic points) imply that the automorphism group of X contains a copy of the automorphism group of the one-dimensional full shift, and hence contains nontrivial elements of infinite order. On the other hand we construct a mixing, positive entropy SFT which, modulo the shift action, is the union of finite groups. 1