Abstract
For a continuous map f on a compact metric space we study the geometry and entropy of the generalized rotation set Rot(Φ). Here Φ = (ϕ1, ..., ϕ m ) is a m-dimensional continuous potential and Rot(Φ) is the set of all µ-integrals of Φ and µ runs over all f-invariant probability measures. It is easy to see that the rotation set is a compact and convex subset of ℝm. We study the question if every compact and convex set is attained as a rotation set of a particular set of potentials within a particular class of dynamical systems. We give a positive answer in the case of subshifts of finite type by constructing for every compact and convex set K in ℝm a potential Φ = Φ(K) with Rot(Φ) = K. Next, we study the relation between Rot(Φ) and the set of all statistical limits Rot Pt (Φ). We show that in general these sets differ but also provide criteria that guarantee Rot(Φ) = Rot Pt (Φ). Finally, we study the entropy function w ↦ H(w),w ∈ Rot(Φ). We establish a variational principle for the entropy function and show that for certain non-uniformly hyperbolic systems H(w) is determined by the growth rate of those hyperbolic periodic orbits whose Φ-integrals are close to w. We also show that for systems with strong thermodynamic properties (sub-shifts of finite type, hyperbolic systems and expansive homeomorphisms with specification, etc.) the entropy function w ↦ H(w) is real-analytic in the interior of the rotation set.
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This work was partially supported by a grant from the Simons Foundation (#209846 to Christian Wolf).
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Kucherenko, T., Wolf, C. Geometry and entropy of generalized rotation sets. Isr. J. Math. 199, 791–829 (2014). https://doi.org/10.1007/s11856-013-0053-4
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DOI: https://doi.org/10.1007/s11856-013-0053-4