Karl Petersen, Anthony Quas, Sujin Shin
Given an irreducible subshift of finite type X, a subshift Y, a factor map π: X \to Y, and an ergodic invariant measure νon Y, there can exist more than one ergodic measure on X which projects to νand has maximal entropy among all measures in the fiber, but there is an explicit bound on the number of such maximal entropy preimages.
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We show that the smooth measure is the unique measure of maximal entropy for the Teichmueller flow on the moduli space of abelian differentials.
In this paper we use complex techniques to study the structure of real Henon diffeomorphisms of maximal topological entropy.
Hereditary subshifts whose measure of maximal entropy has no Gibbs property
本文证明遗传闭包的最大熵测度具有 Gibbs 性质当且仅当 Mirsky 测度纯原子，并给出 Keller 定理的逆定理。
We classify complex projective surfaces with an automorphism of positive entropy for which the unique invariant measure of maximal entropy is absolutely continuous with respect to Lebesgue measure.
It is known that piecewise affine surface homeomorphisms always have measures of maximal entropy. This is easily seen to fail in the discontinuous case. Here we describe a piecewise affine, globally continuous surface map with no measure of maximal entropy.
We show that, for every positive real number h and every positive integer p, there exist oriented graphs G, G' (with countably many vertices) that are strongly connected, of period p, of Gurevich entropy h, such that G is positive recurrent (thus the topological Markov chain on G admits a measure of maximal entropy) and G' is transient (thus the topological Markov chain on G' admits no measure of maximal entropy).
For any $1\leq r<\infty$, we build on the disk and therefore on any manifold, a $C^r$-diffeomorphism with no measure of maximal entropy.
We give a new type of sufficient condition for the existence of measures with maximal entropy for an interval map $f$, using some non-uniform hyperbolicity to compensate for a lack of smoothness of $f$. More precisely, if the topological entropy of a $C^1$ interval map is greater than the sum of the local entropy and the entropy of the critical points, then there exists at least one measure with maximal entropy. As a corollary, we obtain that any $C^r$ interval map $f$ such that $h_{\rm top}(f)>2\log\|f'\|_{\infty}/r$ possesses measures with maximal entropy.
Hyperbolicity of maximal entropy measures for certain maps isotopic to Anosov
证明了具有紧致二维中心叶理的环面部分双曲系统遍历极大熵测度的双曲性。
We consider suspension flows with continuous roof function over the full shift $Σ$ on a finite alphabet. For any positive entropy subshift of finite type $Y \subset Σ$, we explictly construct a roof function such that the measure(s) of maximal entropy for the suspension flow over $Σ$ are exactly the lifts of the measure(s) of maximal entropy for $Y$. In the case when $Y$ is transitive, this gives a unique measure of maximal entropy for the flow which is not fully supported. If $Y$ has more than one transitive component, all with the same entropy, this gives explicit examples of suspension flow…
Maximal Entropy Measures for Non-Accessible Topological Skew Products
本文研究一维紧致中心叶层的部分双曲微分同胚，证明在流形为不稳定叶状结构饱和的唯一极小不变集时，极大熵测度要么唯一且非双曲，要么恰有两个双曲遍历测度。
Measures of maximal entropy of bounded density shifts
本文研究有界密度位移的极大熵测度，给出其唯一性的充分条件，证明所有极大熵测度均全支撑，并由此推出有界密度位移具有满射性。
In this note we construct measures of maximal entropy for a certain class of maps with critical points called Viana maps. The main ingredients of the proof are the non-uniform expansion features and the slow recurrence (to the critical set) of generic points with respect to the natural candidates for attaining the topological entropy.
We study suspension flows defined over sub-shifts of finite type with continuous roof functions. We prove the existence of suspension flows with uncountably many ergodic measures of maximal entropy. More generally, we prove that any suspension flow defined over a sub-shift of finite type can be perturbed (by an arbitrarily small perturbation) so that the resulting flow has uncountably many ergodic measures of maximal entropy, and that the same can be arranged so that the new flow has a unique measure of maximal entropy.
Given a compact topological dynamical system (X, f) with positive entropy and upper semi-continuous entropy map, and any closed invariant subset $Y \subset X$ with positive entropy, we show that there exists a continuous roof function such that the set of measures of maximal entropy for the suspension semi-flow over (X,f) consists precisely of the lifts of measures which maximize entropy on Y. This result has a number of implications for the possible size of the set of measures of maximal entropy for topological suspension flows. In particular, for a suspension flow on the full shift on a fini…
The equivalence of precompactness, zero maximal pattern entropy and bounded mean complexity for finite partitions
本文研究了有限划分的低复杂度类型，证明了预紧性、零最大模式熵、有界平均复杂度和均等连续性之间的等价关系。
We show that describing rational functions $f_1,$ $f_2,$ $\dots,f_n$ sharing the measure of maximal entropy reduces to describing solutions of the functional equation $A\circ X_1=A\circ X_2=\dots=A\circ X_n$ in rational functions. We also provide some results about solutions of this equation.
We construct measures of maximal $u$-entropy for any partially hyperbolic diffeomorphism that factors over an Anosov torus automorphism and has mostly contracting center direction. The space of such measures has a finite dimension, and its extreme points are ergodic measures with pairwise disjoint supports.
Effective uniqueness of the measure of maximal entropy in Ornstein's $\bar{d}$-metric
该研究针对拓扑混合有限型移位，证明了Ornstein的$\bar{d}$度量下最大熵测度的有效唯一性，强化了Kadyrov在Wasserstein度量下的相关结果。
We show that $C^\infty$ surface diffeomorphisms with positive topological entropy have at most finitely many ergodic measures of maximal entropy in general, and at most one in the topologically transitive case. This answers a question of Newhouse, who proved that such measures always exist. To do this we generalize Smale's spectral decomposition theorem to non-uniformly hyperbolic surface diffeomorphisms, we introduce homoclinic classes of measures, and we study their properties using codings by irreducible countable state Markov shifts.
We characterize the maximal entropy measures of partially hyperbolic C^2 diffeomorphisms whose center foliations form circle bundles, by means of suitable finite sets of saddle points, that we call skeletons. In the special case of 3-dimensional nilmanifolds other than the torus, this entails the following dichotomy: either the diffeomorphism is a rotation extension of an Anosov diffeomorphism -- in which case there is a unique maximal measure, with full support and zero center Lyapunov exponents -- or there exist exactly two ergodic maximal measures, both hyperbolic and whose center Lyapunov …
We prove a finite smooth version of the entropic continuity of Lyapunov exponents of Buzzi-Crovisier-Sarig for $C^\infty$ surface diffeomorphisms [9]. As a consequence we show that any $C^r$, $r > 1$, smooth surface diffeomorphism $f$ with $h_{top}(f) > \frac{1}{r} \limsup_n \frac{1}{n} \log^+ \|df^n\|$ admits a measure of maximal entropy. We also prove the $C^r$ continuity of the topological entropy at $f$.
Finite Measures of Maximal Entropy for an Open Set of Partially Hyperbolic Diffeomorphisms
本文研究一维中心方向且不稳定熵大于稳定熵的部分双曲微分同胚，证明其仅有有限个遍历最大熵测度，并将相关结果推广至任意维度。
Measure of maximal entropy for minimal Anosov actions
本文研究闭流形上最小Anosov作用的极大熵测度，证明其符合Ruelle-Taylor共振理论，并得出Bowen型公式及周期环面计数结果。
Characterization of Ergodic Measures of Maximal Entropy for Topologically Transitive Partially Hyperbolic Diffeomorphisms with compact center leaves
该文研究三维环面上具紧一维中心叶的拓扑传递部分双曲微分同胚，给出零Lyapunov指数的最大熵遍历测度的数量上界，并完整刻画其支撑集。
Smooth surface systems may contain smooth curves which have no measure of maximal entropy
研究解析子集的最大熵测度，构造含无最大熵测度光滑曲线的曲面系统，并刻画一般及 $h$-扩张系统中相关子集的熵与 Hausdorff 维数性质。
Finiteness of measures of maximal entropy for smooth saddle surface endomorphisms
本文针对拓扑熵大于度的对数的闭曲面$\mathcal{C}^{\infty}$局部微分同胚，通过构造具马尔可夫性的几何矩形族、结合Yomdin理论分析不稳定曲线迭代行为，证明这类映射的最大熵遍历测度数目有限。
On the cardinality of measures of maximal relative entropy for smooth skew products
本文针对传递Anosov基上的$\mathcal C^{1+\alpha}$光滑斜积微分同胚，证明其最大相对熵遍历双曲测度至多可数，且二维纤维情形下正相对拓扑熵时该类遍历测度也至多可数。
Measures of maximal entropy for $C^\infty$ three-dimensional flows
本文证明无边界紧致三维流形上具有正熵的 $C^\infty$ 非奇异流至多存在有限个遍历最大熵测度，推广了 Buzzi-Crovisier-Sarig 的结果，并通过处理 Lyapunov 指数连续性和 Pesin 集均匀大性给出了新证明。
We look at the maximal entropy (MME) measure of the boundaries of connected components of the Fatou set of a rational map of degree greater than or equal to 2. We show that if there are infinitely many Fatou components, and if either the Julia set is disconnected or the map is hyperbolic, then there can be at most one Fatou component whose boundary has positive MME measure. We also replace hyperbolicity by the more general hypothesis of geometric finiteness.
We show the existence and uniqueness of the maximal entropy probability measure for partially hyperbolic diffeomorphisms which are semi-conjugate to nonuniformly expanding maps. Using the theory of projective metric on cones we then prove exponential decay of correlations for Hölder continuous observables and the central limit theorem for the maximal entropy probability measure. Moreover, for systems derived from solenoid we also prove the statistical stability for the maximal entropy probability measure. Finally, we use such techniques to obtain similar results in a context containing partial…
We use maximal entropy methods to examine the distribution properties of primitive integer points on spheres and of CM points on the modular surface. The proofs we give are a modern and dynamical interpretation of Linnik's original ideas and follow techniques presented by Einsiedler, Lindenstrauss, Michel and Venkatesh in 2011.
In this paper, we study the number of ergodic measures of maximal entropy for partially hyperbolic diffeomorphisms defined on $3-$torus with compact center leaves. Assuming the existence of a periodic leaf with Morse-Smale dynamics we prove a sharp upper bound for the number of maximal measures in terms of the number of sources and sinks of Morse-Smale dynamics. A well-known class of examples for which our results apply are the so-called Kan-type diffeomorphisms admitting physical measures with intermingled basins.
We show that time-one maps of transitive Anosov flows of compact manifolds are accumulated by diffeomorphisms robustly satisfying the following dichotomy: either all of the measures of maximal entropy are non-hyperbolic, or there are exactly two ergodic measures of maximal entropy, one with a positive central exponent and the other with a negative central exponent. We establish this dichotomy for certain partially hyperbolic diffeomorphisms isotopic to the identity whenever both of their strong foliations are minimal. Our proof builds on the approach developed by Margulis for Anosov flows wher…
Partially hyperbolic diffeomorphisims with a finite number of measures of maximal entropy
本文证明在中心方向具有一维支配分解且李雅普诺夫指数一致有界的部分双曲微分同胚，其最大熵遍历测度有限，并应用于Anosov派生类及斜积类，同时研究测度数目的上半连续性。
For a class of piecewise hyperbolic maps in two dimensions, we propose a combinatorial definition of topological entropy by counting the maximal, open, connected components of the phase space on which iterates of the map are smooth. We prove that this quantity dominates the measure theoretic entropies of all invariant probability measures of the system, and then construct an invariant measure whose entropy equals the proposed topological entropy. We prove that our measure is the unique measure of maximal entropy, that it is ergodic, gives positive measure to every open set, and has exponential…
We prove a metastability result for finitary microstates which are good models for a Gibbs measure for a nearest-neighbor interaction on a finitely-generated group. This is used to show that any maximal-entropy joining of two such Gibbs states is a relative product over the tail $σ$-algebra, except in degenerate cases. We also use results on extremal cuts of random graphs to further investigate optimal self-joinings of the Ising model on a free group.
We consider topological Markov chains (also called Markov shifts) on countable graphs. We show that a transient graph can be extended to a recurrent graph of equal entropy which is either positive recurrent of null recurrent, and we give an example of each type. We extend the notion of local entropy to topological Markov chains and prove that a transitive Markov chain admits a measure of maximal entropy (or maximal measure) whenever its local entropy is less than its (global) entropy.
Let $X$ be a compact, geodesically complete, locally CAT(0) space such that the universal cover admits a rank one axis. We prove the Bowen-Margulis measure on the space of geodesics is the unique measure of maximal entropy for the geodesic flow, which has topological entropy equal to the critical exponent of the Poincaré series.
We introduce two parametrized families of piecewise affine maps on $[0,1]^2$ and $[0,1]^3$, as generalizations of the heterochaos baker maps which were introduced and investigated in [Y. Saiki, H. Takahasi, J. A. Yorke, Nonlinearity, 34 (2021), 5744--5761] as minimal models of the unstable dimension variability in multidimensional dynamical systems. We show that natural coding spaces of these maps coincide with the Dyck system that has come from the theory of languages. Based on this coincidence, we start to develop a complementary analysis on their invariant measures. As a first attempt, we s…
Measure of maximal entropy for H-flows on non-compact manifolds
本文研究了非紧流形上H流的最大熵度量，通过强正回归假设证明了流存在熵最大化的不变测度，并比较了非紧环境下的不同熵概念。
We study the dynamics of piecewise affine surface homeomorphisms from the point of view of their entropy. Under the assumption of positive topological entropy, we establish the existence of finitely many ergodic and invariant probability measures maximizing entropy and prove a multiplicative lower bound for the number of periodic points. This is intended as a step towards the understanding of surface diffeomorphisms. We proceed by building a jump transformation, using not first returns but carefully selected "good" returns to dispense with Markov partitions. We control these good returns throu…
In this paper we study the sequence of orthonormal polynomials $\{P_n(μ; z)\}$ defined by a probability measure $μ$ with non-polar compact support $S(μ)\subset\mathbb C$. We show that the support of any weak* limit of the sequence of measures of maximal entropy $ω_n$ for $P_n$ is contained in the polynomial-convex hull of $S(μ)$. And for $n$-th root regular measures the $ω_n$ converge weak* to the equilibrium measure on $S(μ)$.
Continuum-wise hyperbolicity, periodic shadowing, and measures of maximal entropy
本文证明具有联合连续稳定/不稳定叶层的cw-双曲同胚满足周期阴影性质，且在拓扑混合时满足周期规范性质，并讨论将Bowen技术应用于获得最大熵测度的困难，给出Walter伪Anosov微分同胚和Sierpiński地毯上同胚的唯一最大熵测度。
Measures of maximal entropy for Markovian dynamics on the Gehman dendrite
研究盖曼枝状图上特定传递动力系统，通过引入马尔可夫映射，用可数马尔可夫图编码动力学，利用相关准则控制最大熵测度存在性，给出任意给定系统的两个马尔可夫扰动，一个有唯一最大熵测度，一个没有。
In this article we discuss relations between algebraic and dynamical properties of non-cyclic semigroups of rational maps.
We prove that any 3-dimensional singular hyperbolic attractor admits for any Hölder continuous potential $V$ at most one equilibrium state for $V$ among regular measures. We give a condition on $V$ which ensures that no singularity can be an equilibrium state. Thus, for these $V$'s, there exists a unique equilibrium state and it is a regular measure. Applying this for $V\equiv 0$, we show that any 3-dimensional singular hyperbolic attractor admits a unique measure of maximal entropy.
Measures of maximal entropy for non-uniformly hyperbolic maps
该研究探讨了非均匀超双曲映射中最大熵测度的唯一性和有限性，通过同宿类分析和多种不同模型的应用，证明了相关测度的有限性或唯一性。
Exponential mixing of measures of maximal entropy for certain skew products
本文研究了某些斜积中最大熵测度的指数混合性，通过纤维熵与李雅普诺夫指数的连续性关系，证明了满足强正回复性质的斜积具有有限数量的最大熵测度，且这些测度具有良好的统计性质。
This paper concerns the Henon family of diffeomorphisms of the plane for which the absolute value of the jacobian parameter is bounded by .08. We describe the parameter locus for which the mapping is a horseshoe.
Uniqueness of the measure of maximal entropy for geodesic flows on surfaces
本文证明了在闭合可定向曲面上，遍历且具有正拓扑熵的几何流具有唯一的最大熵测度，并探讨了SRB测度的唯一性。
We prove inequalities relating the measures of maximal entropy of two patterns u,v where the extender set of u is contained in the extender set of v. Our main results are two generalizations of a Theorem of Meyerovitch; the first applies to all such v,w when G=Z, and the second to v,w with the same shape and any countable amenable finitely generated torsion-free G. As a consequence of our results we give new and simpler proofs of several facts about synchronizing subshifts and we answer a question of Climenhaga.
The squarefree flow is a natural dynamical system whose topological and ergodic properties are closely linked to the behavior of squarefree numbers. We prove that the squarefree flow carries a unique measure of maximal entropy and express this measure explicitly in terms of a skew-product of a Kronecker and a Bernoulli system. Using this characterization and a number-theoretic argument, we then show that the unique maximum entropy measure fails to possess the Gibbs property.
We characterize two of the most studied non-uniform hyperbolicity conditions for rational maps, semi-hyperbolicity and the topological Collet-Eckmann condition, in terms of the maximal entropy measure. Using the same tools in the proof of these results we give an extension of a result of Carleson, Jones and Yoccoz, that semi-hyperbolicity characterizes those polynomial maps whose basin of attraction of infinity is a John domain, to rational maps having a completely invariant attracting basin.
In this paper we prove that for sufficiently large parameters the standard map has a unique measure of maximal entropy (m.m.e.). Moreover, we prove: the m.m.e. is Bernoulli, and the periodic points with Lyapunov exponents bounded away from zero equidistribute with respect to the m.m.e. We prove some estimates regarding the Hausdorff dimension of the m.m.e. and about the density of the support of the measure on the manifold. For a generic large parameter, we prove that the support of the m.m.e. has Hausdorff dimension $2$. We also obtain the $C^2$-robustness of several of these properties.
Continuity properties of ergodic measures of maximal entropy for $C^r$ surface diffeomorphisms
本文研究了$C^r$表面微分同胚最大熵遍历测度的连续性性质，证明了其数量在特定条件下上半连续，并揭示了局部常数性的条件及极限点的遍历性。
Let $Λ$ be a complex manifold and let $(f_λ)_{λ\in Λ}$ be a holomorphic family of rational maps of degree $d\geq 2$ of $\mathbb{P}^1$. We define a natural notion of entropy of bifurcation, mimicking the classical definition of entropy, by the parametric growth rate of critical orbits. We also define a notion a measure-theoretic bifurcation entropy for which we prove a variational principle: the measure of bifurcation is a measure of maximal entropy. We rely crucially on a generalization of Yomdin's bound of the volume of the image of a dynamical ball. Applying our technics to complex dynamics …
Limits of equilibrium states for coupled weakly interacting systems. Application to the measure of maximal entropy
本文研究符号动力系统中由两个独立子系统经孔洞耦合的全局系统的平衡态极限，证明当孔洞缩小时，全局平衡态收敛到两个独立平衡态的凸组合，并应用于最大熵测度。
We consider an abundant class of non-uniformly hyperbolic $C^2$-Hénon like diffeomorphisms called strongly regular and which corresponds to Benedicks-Carleson parameters. We prove the existence of $m>0$ such that for any such diffeomorphism $f$, every invariant probability measure of $f$ has a Lyapunov exponent greater than $m$, answering a question of L. Carleson. Moreover, we show the existence and uniqueness of a measure of maximal entropy, this answers a question of M. Lyubich and Y. Pesin. We also prove that the maximal entropy measure is equi-distributed on the periodic points and is fin…
We consider the dynamical system given by a diagonalizable element $a$ of a closed linear unimodular algebraic subgroup $G$ of the special linear group over the $p$-adic numbers acting by translation on a finite volume quotient $X$. Assuming that this action is exponentially mixing (e.g.\ if $G$ is simple) we give an effective version (in terms of $K$-finite vectors of the regular representation) of the following statement: If $μ$ is an $a$-invariant probability measure with measure-theoretical entropy close to the topological entropy of $a$ then $μ$ is close to the unique $G$-invariant probab…
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