On a Rice theorem for dynamical properties of SFTs on groups

Abstract

Let $G$ be a group with undecidable domino problem, such as ${\mathbb{Z}}^2$. We prove that all nontrivial dynamical properties for sofic $G$-subshifts are undecidable, that this is not true for $G$-SFTs, and an undecidability result for dynamical properties of $G$-SFTs similar to the Adian-Rabin theorem. Furthermore we prove a Rice-like result for dynamical invariants asserting that every computable real-valued invariant for $G$-SFTs that is monotone by disjoint unions and products is constant.

arXiv commentRevised version