Thermodynamical $u$-formalism I: measures of maximal $u$-entropy for maps that factor over Anosov

Anosov齐性空间中极大平坦柱面与完整和乐的联合等分布

Joint equidistribution of maximal flat cylinders and holonomies for Anosov homogeneous spaces

本研究针对带极小抛物子群的连通实半单代数群中的Zariski稠密Anosov子群，证明了本原元共轭类对应极大平坦柱面，刻画了周长趋于无穷时柱面与和乐的联合等分布，给出秩一闭测地线相关结果的Anosov类比。

Sectional-Anosov flows in higher dimensions

A sectional-Anosov flow on a manifold M is a C^1 vector field inwardly transverse to the boundary for which the maximal invariant is sectional-hyperbolic. We prove that every attractor of every vector field C^1 close to a transitive sectional-Anosov flow with singularities on a compact manifold has a singularity. This extends the three-dimensional result obtained in [Morales, C.A., The explosion of singular-hyperbolic attractors].

Entropy rigidity for 3D conservative Anosov flows and dispersing billiards

Given an integer $k \geq 5$, and a $C^k$ Anosov flow $Φ$ on some compact connected $3$-manifold preserving a smooth volume, we show that the measure of maximal entropy (MME) is the volume measure if and only if $Φ$ is $C^{k-\varepsilon}$-conjugate to an algebraic flow, for $\varepsilon>0$ arbitrarily small. Besides the rigidity, we also study the entropy flexibility, and show that the metric entropy with respect to the volume measure and the topological entropy of suspension flows over Anosov diffeomorphisms on the $2$-torus achieve all possible values subject to natural normalizations. Moreov…

Thermodynamics of smooth models of pseudo-Anosov homeomorphisms

We develop a thermodynamic formalism for a smooth realization of pseudo-Anosov surface homeomorphisms. In this realization, the singularities of the pseudo-Anosov map are assumed to be fixed, and the trajectories are slowed down so the differential is the identity at these points. Using Young towers, we prove existence and uniqueness of equilibrium states for geometric $t$-potentials. This family of equilibrium states includes a unique SRB measure and a measure of maximal entropy, the latter of which has exponential decay of correlations and the Central Limit Theorem.

Invariant measures for horospherical actions and Anosov groups

Let $Γ$ be a Zariski dense Anosov subgroup of a connected semisimple real algebraic group $G$. For a maximal horospherical subgroup $N$ of $G$, we show that the space of all non-trivial $NM$-invariant ergodic and $A$-quasi-invariant Radon measures on $Γ\backslash G$, up to proportionality, is homeomorphic to ${\mathbb R}^{\text{rank}\,G-1}$, where $A$ is a maximal real split torus and $M$ is a maximal compact subgroup which normalizes $N$. One of the main ingredients is to establish the $NM$-ergodicity of all Burger-Roblin measures.

Entropy rigidity and flexibility for suspension flows over Anosov diffeomorphisms

For any $C^\infty$, area-preserving Anosov diffeomorphism $f$ of a surface, we show that a suspension flow over $f$ is $C^\infty$-conjugate to a constant-time suspension flow of a hyperbolic automorphism of the two torus if and only if the volume measure is the measure with maximal entropy. We also show that the the metric entropy with respect to the volume measure and the topological entropy of suspension flow over Anosov diffeomorphisms on torus achieve all possible values. Our results fit into two programs related to entropy rigidity and flexibility of Anosov systems.

Maximal Representations of Surface Groups: Symplectic Anosov Structures

Let G be a connected semisimple Lie group such that the associated symmetric space X is Hermitian and let Gamma be the fundamental group of a compact orientable surface of genus at least 2. We survey the study of maximal representations, that is the subset of Hom(Gamma,G) which is a union of components characterized by the maximality of the Toledo invariant. Then we concentrate on the particular case G=SP(2n,R), and we show that the image of Gamma under any maximal representation is a discrete faithful realization of Gamma as a Kleinian group of complex motions in X with an associated Anosov s…

具有SRB性质的最大熵测度

Measures of maximal entropy that are SRB

本文研究$T^3$上DA-微分同胚的最大熵测度的SRB性质，给出其为SRB测度的充要条件（正Lyapunov指数和在支撑集周期轨道上与线性Anosov映射一致），并指出该刚性结果弱于Katok猜想且附示例。

Mono-atomic disintegration and Lyapunov exponents for derived from Anosov diffeomorphisms

In this paper we mainly address the problem of disintegration of Lebesgue measure and measure of maximal entropy along the central foliation of (conservative) Derived from Anosov (DA) diffeomorphisms. We prove that for accessible DA diffeomorphisms of $\mathbb{T}^3$, atomic disintegration has the peculiarity of being mono-atomic (one atom per leaf). We further provide open and non-empty condition for the existence of atomic disintegration. Finally, we prove some new relations between Lyapunov exponents of DA diffeomorphisms and their linearization.

3-维 тор斯上 Anosov 流形的不稳定熵

Unstable entropy for Anosov diffeomorphisms on the 3-torus

本文研究了 3-维 торus 上 Anosov 流形的不稳定熵，通过构造 Margulis 测度系统，揭示了最大不稳定熵测度与共振态之间的关系。

Diffeomorphism group valued cocycles over higher rank abelian Anosov actions

We prove that every smooth diffeomorphism group valued cocycle over certain abelian Anosov actions on tori (and more generally on infranilmanifolds), is a smooth coboundary on a finite cover, if the cocycle is center bunched and trivial at a fixed point. For smooth cocycles which are not trivial at a fixed point, we have smooth reduction of cocycles to constant ones, when lifted to the universal cover. These results on cocycle trivialisation apply, via the existing global rigidity results, to maximal Cartan actions by Anosov diffeomorphisms (with at least one transitive), on any compact smooth…

相对Anosov群：有限性、最大熵测度与重参数化

Relatively Anosov groups: finiteness, measure of maximal entropy, and reparameterization

本文针对相对Anosov子群，通过Groves-Manning空间测地流重参数化流空间，证明了Bowen-Margulis-Sullivan测度有限、唯一且强混合，推广了Kleinian群经典结果至高秩。

Nonlocally maximal and premaximal hyperbolic sets

We prove that for any closed manifold of dimension 3 or greater that there is an open set of smooth flows that have a hyperbolic set that is not contained in a locally maximal one. Additionally, we show that the stabilization of the shadowing closure of a hyperbolic set is an intrinsic property for premaximality. Lastly,we review some results due to Anosov that concern premaximality.

非可达拓扑斜积的极大熵测度

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。

Anosov群的极限集上的二分法与测度

Dichotomy and measures on limit sets of Anosov groups

本文证明Anosov子群的共形测度支撑在极限集上当且仅当其维数临界，由此得到测度唯一性，并推广了Hopf-Tsuji-Sullivan二分法及Ahlfors测度猜想。

d维环面上与Anosov微分同胚同痕的熵稳定性

Entropy stability for diffeomorphisms isotopic to Anosov on $\mathbb{T}^d$

本文研究d维环面上与线性Anosov自同构同痕的部分双曲微分同胚的拓扑熵，证明一类DA映射的拓扑熵与线性映射一致，得到低振荡势的平衡态唯一性等结果，还构造出拓扑熵严格大于线性部分的动态相容微分同胚。

Maximal entropy measures of diffeomorphisms of circle fiber bundles

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 …

Horospherical invariant measures and a rank dichotomy for Anosov groups

Let $G=\prod_{i=1}^{r} G_i$ be a product of simple real algebraic groups of rank one and $Γ$ an Anosov subgroup of $G$ with respect to a minimal parabolic subgroup. For each $v$ in the interior of a positive Weyl chamber, let $\mathcal R_v\subsetΓ\backslash G$ denote the Borel subset of all points with recurrent $\exp (\mathbb R_+ v)$-orbits. For a maximal horospherical subgroup $N$ of $G$, we show that the $N$-action on ${\mathcal R}_v$ is uniquely ergodic if $r={rank}(G)\le 3$ and $v$ belongs to the interior of the limit cone of $Γ$, and that there exists no $N$-invariant {Radon} measure on …

The centralizer of $C^r$-generic diffeomorphisms at hyperbolic basic sets is trivial

In the late nineties, Smale proposed a list of problems for the next century and, among these, it was conjectured that for every $r\ge 1$ a $C^r$-generic diffeomorphism has trivial centralizer. Our contribution here is to prove the triviality of $C^r$-centralizers on hyperbolic basic sets. In particular, $C^r$-generic transitive Anosov diffeomorphisms have a trivial $C^1$-centralizer. These results follow from a more general criterium for expansive homeomorphisms with the gluing orbit property. We also construct a linear Anosov diffeomorphism on $\mathbb T^3$ with discrete, non-trivial central…

On conservative partially hyperbolic abelian actions with compact center foliation

We consider smooth partially hyperbolic volume preserving Z^k actions on smooth manifolds, with uniformly compact center foliation. We show that under certain irreducibility condition on the action, bunching and uniform quasiconformality conditions, the action is a smooth fiber bundle extension of an Anosov action, or the center foliation is pathological. We obtain several corollaries of this result. For example, we prove a global dichotomy result that any smooth conservative circle extension over a maximal Cartan action is either essentially a product of an action by rotations and a linear An…

Half-delocalization of eigenfunctions for the Laplacian on an Anosov manifold

We study the high-energy eigenfunctions of the Laplacian on a compact Riemannian manifold with Anosov geodesic flow. The localization of a semiclassical measure associated with a sequence of eigenfunctions is characterized by the Kolmogorov-Sinai entropy of this measure. We show that this entropy is necessarily bounded from below by a constant which, in the case of constant negative curvature, equals half the maximal entropy. In this sense, high-energy eigenfunctions are at least half-delocalized.

光滑斜积的最大相对熵测度的基数

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。

Flexibility of Lyapunov exponents with respect to two classes of measures on the torus

We consider a smooth area-preserving Anosov diffeomorphism $f\colon \mathbb T^2\rightarrow \mathbb T^2$ homotopic to an Anosov automorphism $L$ of $\mathbb T^2$. It is known that the positive Lyapunov exponent of $f$ with respect to the normalized Lebesgue measure is less than or equal to the topological entropy of $L$, which, in addition, is less than or equal to the Lyapunov exponent of $f$ with respect to the probability measure of maximal entropy. Moreover, the equalities only occur simultaneously. We show that these are the only restrictions on these two dynamical invariants.

不变性原理与非紧中心叶状结构

Invariance principle and non-compact center foliations

本文将部分双曲系统的不变性原理推广到非紧中心叶情形，证明中心 Lyapunov 指数为零时测度具有和乐不变的中心分解，并用于分类最大熵测度和研究 Anosov 流时间一映射扰动的物理测度。

Statistical properties of the maximal entropy measure for partially hyperbolic attractors

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…

帕特森-苏利文构造与Anosov流的全局叶几何

The Patterson-Sullivan construction and global leaf geometry for Anosov flows

本文通过帕特森-苏利文构造方法，研究了Anosov流的全局叶几何，证明了中心-不稳定叶的超几何性质及基本群的超几何性。

具有有限个最大熵测度的部分双曲微分同胚

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。

连续统双曲性、周期阴影和最大熵测度

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。

Lipschitz sub-actions for locally maximal hyperbolic sets of a $C^1$ maps

Livšic theorem asserts that, for Anosov diffeomorphisms/flows, a Lipschitz observable is a coboundary if all its Birkhoff sums on every periodic orbits are equal to zero. The transfer function is then Lipschitz. We prove a positive Livšic theorem which asserts that a Lipschitz observable is bounded from below by a coboundary if and only if all its Birkhoff sums on periodic orbits are non negative. The new result is that the coboundary can be chosen Lipschitz. The map is only assumed to be $C^1$ and hyperbolic, but not necessarily bijective nor transitive. We actually prove our main result in t…

Hyperbolic sets that are not contained in a locally maximal one

In this paper we study two properties related to the structure of hyperbolic sets. First we construct new examples answering in the negative the following question posed by Katok and Hasselblatt. Let $Λ$ be a hyperbolic set, and let $V$ be an open neighborhood of $Λ$. Does there exist a locally maximal hyperbolic set $\widetildeΛ$ such that $Λ\subset \widetildeΛ \subset V $? We show that such examples are present in linear anosov diffeomorophisms of $\mathbb{T}^3$, and are therefore robust. Also we construct new examples of sets that are not contained in any locally maximal hyperbolic set. The…

Anosov齐性空间上几何测度的遍历分解

Ergodic decompositions of geometric measures on Anosov homogeneous spaces

本文研究Anosov齐性空间上几何测度的遍历分解，给出Burger-Roblin测度的$N$-分解与Bowen-Margulis-Sullivan测度的$A$-分解，并强化了非平凡不变遍历Radon测度空间的分类结果。

Differentiability of thermodynamical quantities in non-uniformly expanding dynamics

In this paper we study the ergodic theory of a robust non-uniformly expanding maps where no Markov assumption is required. We prove that the topological pressure is differentiable as a function of the dynamics and analytic with respect to the potential. Moreover we not only prove the continuity of the equilibrium states and their metric entropy as well as the differentiability of the maximal entropy measure and extremal Lyapunov exponents with respect to the dynamics. We also prove a local large deviations principle and central limit theorem and show that the rate function, mean and variance v…

具有最大$u$-熵的$c$-$cu$-态的有限性与几何结构

Finiteness and Geometric structure of $c$-$cu$-States with Maximal $u$-Entropy

本研究针对$c$-混合系统中具有最大$u$-熵的$c$-$cu$-态，证明其支撑两两不同的最大数量有限，通过改进Smale方法构造了具有混合中心的四维环面微分同胚实例，为物理测度的半连续变化提供了具体例证。

夹层子移位的基本热力学形式化

Basic thermodynamical formalism for sandwich subshifts

本文研究了夹层子移位的基本热力学形式化，引入并分析了遗传与从属子移位及其双侧类比的测度论性质，受 $\mathscr{B}$-free 系统理论启发。

通过共形形变构造部分双曲测地流

Partially hyperbolic geodesic flow via conformal deformation

本文利用共形形变构造非 Anosov 部分双曲测地流，明确所需条件，并得到非正曲率、遍历性、最大熵测度唯一性及含共轭点的例子。

Thermodynamics of the Katok Map

We effect thermodynamical formalism for the non-uniformly hyperbolic $C^\infty$ map of the two dimensional torus known as the Katok map. It is a slowdown of a linear Anosov map near the origin and it is a local (but not small) perturbation. We prove the existence of equilibrium measures for any continuous potential function and obtain uniqueness of equilibrium measures associated to the geometric $t$-potential $φ_t=-t\log |df|_{E^u(x)}|$ for any $t\in(t_0,\infty)$, $t\neq 1$ where $E^u(x)$ denotes the unstable direction. We show that $t_0$ tends to $-\infty$ as the size of the perturbation ten…

曲面自同胚的关键因素

Essential factors for surface homeomorphisms

针对亏格至少为1的闭可定向曲面上同痕于伪阿诺索夫自同胚的自同胚，通过坍缩万有覆盖中迭代直径一致有界的极大连续统构造单调因子，该因子具强混沌特征且可保面积，其极大熵测度为全支撑伯努利测度。

曲面上的熵与半共轭

Entropy and semiconjugacy on surfaces

针对伪阿诺索夫同胚类中拓扑熵相同的微分同胚，本文修正了Handel关于半共轭原像连通性的结论，并证明了对应不变测度的性质及半共轭诱导的度量同构。

部分双曲微分同胚的非双曲性程度

The amount of nonhyperbolicity for partially hyperbolic diffeomorphisms

本研究针对一类具有一维中心的部分双曲微分同胚，分析其中心李雅普诺夫指数水平集的熵，构造零指数水平集并证明其熵的正最大值与有限时间指数一致收敛性，涵盖多种鲁棒传递系统包括动力学不一致的反常例子。

Equilibrium Measures for Maps with Inducing Schemes

We introduce a class of continuous maps f of a compact metric space I admitting inducing schemes and describe the tower constructions associated with them. We then establish a thermodynamical formalism, i.e., describe a class of real-valued potential functions ϕon I which admit unique equilibrium measures μ_ϕminimizing the free energy for a certain class of measures. We also describe ergodic properties of equilibrium measures including decay of correlation and the Central Limit Theorem. Our results apply in particular to some one-dimensional unimodal and multimodal maps as well as to multidime…

扩张Thurston映射的基态与周期轨道

Ground states and periodic orbits for expanding Thurston maps

本文研究扩张Thurston映射的最大化测度与基态，证明典型周期优化猜想成立，并推广到Misiurewicz–Thurston有理映射。