Synchronizing Dynamical Systems: Shift Spaces and $K$-Theory

• Main Author: Stocker, Andrew M
• Format: Journal Article
• Language: English
• Published: 12.08.2022
• Subjects: Mathematics - Dynamical Systems; Mathematics - K-Theory and Homology; Mathematics - Operator Algebras
• DOI: 10.48550/arxiv.2208.06200

Building on previous work by the author and Robin Deeley, we give a thorough presentation of the techniques developed for synchronizing dynamical systems in the special case of synchronizing shift spaces. Following work of Thomsen, we give a construction of the homoclinic and heteroclinic $C^\ast$-algebras of a shift space in terms of Bratteli diagrams. Lastly we present several specific examples which demonstrate these techniques. For the even shift we give a complete computation of all the associated invariants. We also present an example of a strictly non-sofic synchronizing shift. In particular we discuss the rank of the $K$-theory of the homoclinic algebra of a shift space and its implications. We also give a construction for producing from any minimal shift a synchronizing shift whose set of non-synchronizing points is exactly the original minimal shift.