Abstract:
New ergodic theorems are obtained for measure-preserving actions of free semigroups and groups. These theorems are derived from ergodic theorems for Markov operators. This approach also allows one to obtain ergodic theorems for some classes of Markov semigroups. Results of the paper generalize classical ergodic theorems of Kakutani, Oseledets, and Guivarc'h, and recent ergodic theorems of Grigorchuk, Nevo, and Nevo and Stein.
Citation:
A. I. Bufetov, “Operator Ergodic Theorems for Actions of Free Semigroups and Groups”, Funktsional. Anal. i Prilozhen., 34:4 (2000), 1–17; Funct. Anal. Appl., 34:4 (2000), 239–251
Elias Zimmermann, “Fiber entropy and algorithmic complexity of random orbits”, DCDS, 42:11 (2022), 5289
Alexander I. Bufetov, Alexey Klimenko, Caroline Series, “A symmetric Markov coding and the ergodic theorem for actions of Fuchsian Groups”, Mathematics Research Reports, 1 (2020), 5–14
Rahimi M., “Entropy of Action of Semi-Groups”, Iran. J. Sci. Technol. Trans. A-Sci., 41:A1 (2017), 179–183
Bowen L., Bufetov A., Romaskevich O., “Mean convergence of Markovian spherical averages for measure-preserving actions of the free group”, Geod. Dedic., 181:1 (2016), 293–306
Bowen L., Nevo A., “Von Neumann and Birkhoff Ergodic Theorems For Negatively Curved Groups”, Ann. Sci. Ec. Norm. Super., 48:5 (2015), 1113–1147
A. I. Bufetov, A. V. Klimenko, “Maximal inequality and ergodic theorems for Markov groups”, Proc. Steklov Inst. Math., 277 (2012), 27–42
Bufetov A., Klimenko A., “On Markov Operators and Ergodic Theorems for Group Actions”, Eur. J. Comb., 33:7, SI (2012), 1427–1443
Bufetov A.I., Khristoforov M., Klimenko A., “Cesaro Convergence of Spherical Averages for Measure-Preserving Actions of Markov Semigroups and Groups”, Int. Math. Res. Notices, 2012, no. 21, 4797–4829
G. Ya. Grabarnik, A. A. Katz, L. A. Shwartz, “On non-commutative ergodic type theorems for free finitely generated semigroups”, Vladikavk. matem. zhurn., 9:1 (2007), 38–47
Anantharaman-Delaroche, C, “On ergodic theorems for free group actions on noncommutative spaces”, Probability Theory and Related Fields, 135:4 (2006), 520
Amos Nevo, Handbook of Dynamical Systems, 1, 2006, 871
Arnold's Problems, 2005, 181
Bufetov, AI, “Convergence of spherical averages for actions of free groups”, Annals of Mathematics, 155:3 (2002), 929
A. M. Vershik, “Dynamic theory of growth in groups: Entropy, boundaries, examples”, Russian Math. Surveys, 55:4 (2000), 667–733
R. I. Grigorchuk, “An Ergodic Theorem for the Action of a Free Semigroup”, Proc. Steklov Inst. Math., 231 (2000), 113–127