Masato Tsujii, Zhiyuan Zhang
We show that a topologically mixing $C^\infty$ Anosov flow on a 3 dimensional compact manifold is exponential mixing with respect to any equilibrium measure with Holder potential.
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Exponential decay of random correlations for random Anosov systems mixing on fibers
本文借助Birkhoff锥方法，证明了满足Anosov性与纤维拓扑混合的外力驱动曲面Anosov系统，其对应唯一随机SRB测度的Hölder可观测量淬灭随机关联具有指数衰减的统计特性。
In this paper, we study the complicated dynamics of Anosov systems driven by an external force in the context of geometric theory (an abundance of random periodic points and random horseshoes) and smooth ergodic theory (random periodic measures and random Liv\v sic Theorem).
The purpose of this paper is to establish mixing rates for infinite measure preserving almost Anosov diffeomorphisms on the two-dimensional torus. The main task is to establish regular variation of the tails of the first return time to the complement of a neighbourhood of the neutral fixed point.
We establish sharp bounds on the mixing rates of a class of two dimensional non-uniformly hyperbolic symplectic maps. This provides a primer on how to investigate such questions in a concrete example and, at the same time, it solves a controversy between previous rigorous results and numerical experiments.
We study circle extensions of analytic Anosov maps on the two torus: these are examples of partially hyperbolic maps for which the qualitative ergodic theory is well understood. In this paper we investigate rates of mixing (for the SRB measure) and prove explicit lower bounds involving the topological pressure of two times the unstable Jacobian. In particular we study the case when the extension function ("roof function") is given by a random trigonometric polynomial.
Stretched-exponential mixing for surface semiflows and Anosov flows
本文证明曲面悬挂半流在屋顶函数 Lipschitz 且非局部常上同调时关于 SRB 测度拉伸指数混合，并推广至双曲斜积、吸引子及余维一拓扑混合 Anosov 流。
We prove that an Anosov flow with $\mathcal{C}^{1}$ stable bundle mixes exponentially whenever the stable and unstable bundles are not jointly integrable. This allows us to show that if a flow is sufficiently close to a volume-preserving Anosov flow and $\operatorname{dim} \mathbb{E}_s = 1$, $\operatorname{dim} \mathbb{E}_u \geq 2$ then the flow mixes exponentially whenever the stable and unstable bundles are not jointly integrable.This implies the existence of non-empty open sets of exponentially mixing Anosov flows. As part of the proof of this result we show that $\mathcal{C}^{1+}$ uniforml…
Let $M$ be a closed $3$-dimensional Riemann manifold and let $3\le r\le \infty$. We prove that there exists an open dense subset in the space of $C^r$ volume-preserving Anosov flows on $M$ such that all the flows in it are exponentially mixing.
Exponential decay of correlations for $\Co^{(4)}$ Contact Anosov flows is established. This implies, in particular, exponential decay of correlations for all smooth geodesic flows in strictly negative curvature.
We construct a plethora of Anosov-Katok diffeomorphisms with non-ergodic generic measures and various other mixing and topological properties. We also construct an explicit collection of the set containing the generic points of the system with interesting values of its Hausdorff dimension.
For the time-one map $f$ of a contact Anosov flow on a compact Riemann manifold $M$, satisfying a certain regularity condition, we show that given a Gibbs measure on $M$, a sufficiently large Pesin regular set $P_0$ and an arbitrary $δ\in (0,1)$, there exist positive constants $C$ and $c$ such that for any integer $n \geq 1$, the measure of the set of those $x\in M$ with $f^k(x) \notin P_0$ for at least $δn$ values of $k = 0,1, \ldots,n-1$ does not exceed $C e^{-cn}$.
On a compact manifold of any dimension $d\geq 3$, we show that joint non-integrability of the stable and unstable foliation of a hyperbolic attractor with one-dimensional expanding direction, for a vector field of class $C^2$, implies exponential mixing with respect to its physical measure. Consequently, the set of Axiom A vector fields which mix exponentially with respect to the physical measure of its non-trivial attractors contains a $C^1$-open and $C^2$-dense subset of the set of all Axiom A vector fields. Moreover, for codimension one $C^2$ Anosov flows in any dimension $d\geq 3$, if the …
In the late seventies, Sullivan showed that for a convex cocompact subgroup $Γ$ of $\operatorname{SO}^\circ(n,1)$ with critical exponent $δ>0$, any $Γ$-conformal measure on $\partial \mathbb{H}^n$ of dimension $δ$ is necessarily supported on the limit set $Λ$ and that the conformal measure of dimension $δ$ exists uniquely. We prove an analogue of this theorem for any Zariski dense Anosov subgroup of a connected semisimple real algebraic group $G$ of rank at most $3$. We also obtain the local mixing for generalized BMS measures on $Γ\backslash G$ including Haar measures.
In the hyperspace of subcontinua of a compact surface we consider a second order Hausdorff distance. This metric space is compactified in such a way that the stable foliation of a pseudo-Anosov map is naturally identified with a hypercontinuum. We show that negative iterates of a stable arc converges to this hypercontinuum in the considered metric. Some dynamical properties of pseudo-Anosov maps, as topological mixing and the density of stable leaves, are generalized for cw-expansive homeomorphisms of pseudo-Anosov type on compact metric spaces.
Gibbs measures for contact Anosov flows are all exponentially mixing
通过增强Dolgopyat方法，证明接触Anosov流的所有吉布斯测度对Hölder观测具有指数衰减相关性。
Counting, mixing and equidistribution for GPS systems with applications to relatively Anosov groups
本文为几何有限收敛群作用相关流空间上的有限BMS测度建立了计数、混合与等分布结果，并证明其适用于相对Anosov群相关的流空间。
Exponential mixing via invariant foliations and relatively Anosov homeomorphisms
该研究构造了一类闭流形上的保体积同胚，实现了Hölder可观测量的相关性指数衰减，肯定了Dolgopyat和Pesin的相关猜想，还给出了无穷多个无对应微分同胚的此类流形实例。
Effective Equidistribution for Contact Anosov flows in Dimension Three
本文研究了三维空间中接触Anosov流的闭合周期轨道包的有效等分布性质，证明了其以指数速率等分布。
It was proven by Ures that $C^1$ diffeomorphism on three dimensional torus that is derived from Anosov admits a unique maximal measure. Here we show that the maximal measure has exponential decay of correlations for Hölder observables, assuming the middle eigenvalue of the linear Anosov model is contracting.
Pesin sets are measurable sets along which the behavior of a matrix cocycle above a measure preserving dynamical system is explicitly controlled. In uniformly hyper-bolic dynamics, we study how often points return to Pesin sets under suitable conditions on the cocycle: if it is locally constant, or if it admits invariant holonomies and is pinching and twisting, we show that the measure of points that do not return a linear number of times to Pesin sets is exponentially small. We discuss applications to the exponential mixing of contact Anosov flows, and counterexamples illustrating the necessi…
A cohomological approach to Ruelle-Pollicott resonances and speed of mixing of Anosov diffeomorphisms
通过定义各向异性de Rham上同调并证明其与标准上同调同构，揭示了Anosov微分同胚的Ruelle-Pollicott共振与动力系统在de Rham上同调上诱导作用的特征值之间的深刻联系，并由此得到混合速度的上同调界。
$C^0$-Contact Anosov flows
本文证明了常负曲率流形上测地流的光滑重参数化是接触 Anosov 流，由此给出一类新的指数混合 Anosov 流，并引入 $C^0$-接触概念，证明经典 Gray 稳定性定理在此设定下失效。
In this article, we develop a geometric framework to study the notion of semi-minimality for the generic type of a smooth autonomous differential equation $(X,v)$, based on the study of rational factors of $(X,v)$ and of algebraic foliations on $X$, invariant under the Lie-derivative of the vector field $v$. We then illustrate the effectiveness of these methods by showing that certain autonomous algebraic differential equation of order three defined over the field of real numbers --- more precisely, those associated to mixing, compact, Anosov flows of dimension three --- are generically disint…
We show that genuinely higher rank expanding actions of abelian semi-groups on compact manifolds are $C^{\infty}$-conjugate to affine actions on infra-nilmanifolds. This is based on the classification of expanding diffeomorphisms up to \holder conjugacy by Gromov and Shub, and is similar to recent work on smooth classification of higher rank Anosov actions on tori and nilmanifolds. To prove regularity of the conjugacy in the higher rank setting, we establish exponential mixing of solenoid actions induced from semi-group actions by nilmanifold endomorphisms, a result of independent interest. We…
We establish exponential decay of correlations of all orders for locally $G$-accessible isometric extensions of transitive Anosov flows, under the assumption that the strong stable and strong unstable foliations of the base Anosov flow are jointly $C^1$. This is accomplished by translating accessibility properties of the extension into local non-integrability estimates measured by Dolgopyat's infinitesimal transitivity group, from which we obtain contraction properties for a class of 'twisted' symbolic transfer operators.
We consider extensions of Anosov diffeomorphisms of an infranilmanifold by the real vector space R^ω. Our main result, based on the analogous theorem in finite dimensions proven by Nitica and Pollicott, is that any Holder cocycle satisfying an obvious obstruction induces a topologically transitive extension (topologically weak mixing, in fact). We show how to construct cocycles satisfying these conditions for any Anosov diffeomorphism, and then observe that unlike the finite dimensional case, where cocycles satisfying the obstruction are C^0-stably transitive, there can be no infinite-dimensio…
We prove exponential decay of correlations for Hölder continuous observables with respect to any Gibbs measure for contact Anosov flows admitting Pesin sets with exponentially small tails. This is achieved by establishing strong spectral estimates for certain Ruelle transfer operators for such flows.
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.
In this work we study strong spectral properties of Ruelle transfer operators related to a large family of Gibbs measures for contact Anosov flows. The ultimate aim is to establish exponential decay of correlations for Hölder observables with respect to a very general class of Gibbs measures. The approach invented in 1997 by Dolgopyat \cite{D1} and further developed in \cite{St2} is substantially refined here, allowing to deal with much more general situations than before, although we still restrict ourselves to the uniformly hyperbolic case. A rather general procedure is established which pro…
Perturbation of the time-1 map of a generic volume-preserving $3$-dimensional Anosov flow
研究在C^s拓扑下接近体积保持3维阿诺索夫流时间-1映射的微分同胚，证明其动力学性质，包括混合性、唯一物理测度及无周期点的示例。
Mixing Rates for Analytic Observables: Toral Endomorphisms and Anosov Blaschke Deformations
该研究分析解析观测值的混合率，构造两类Anosov Blaschke形变，证明真正非线性系统存在双指数混合，且尖锐指数不连续，还为环面自同构及高阶作用建立双指数界。
Exponential mixing of frame flows for three dimensional manifolds of quarter-pinched negative curvature
研究了三维四分针尖负曲率流形的框架流指数混合性，通过构造Young塔模型和加强Dolgopyat估计，扩展到Anosov流的torus扩展。
Exponential prime orbit theorems for Anosov subgroups
本文针对连通半单实代数群中的Zariski稠密Anosov子群，通过将Jordan投影解释为自然流的周期并证明指数混合，得到了loxodromic元素共轭类的计数定理（含幂次误差项），并证明了Selberg zeta函数的谱间隙存在性。
Starting from any pseudo-Anosov map $φ$ on a surface of genus $g \geqslant 2$, we construct explicitly a family of Derived from pseudo-Anosov maps $f$ by adapting the construction of Smale's Derived from Anosov maps on the two-torus. This is done by perturbing $φ$ at some fixed points. We first consider perturbations at every conical fixed point and then at regular fixed points. We establish the existence of a measure $μ$, supported by the non-trivial unique minimal component of the stable foliation of $f$, with respect to which $f$ is mixing. In the process, we construct a uniquely ergodic Ge…
Local mixing of one-parameter diagonal flows on Anosov homogeneous spaces
本文证明了连通半单实代数群上Zariski稠密Anosov子群商空间中，单参数对角流关于Bowen--Margulis--Sullivan测度的局部混合，给出了带横截偏差的相关函数指数衰减一致界，并支撑了矩阵系数衰减的渐近公式应用。
The main result of this article is that if a $3$-manifold $M$ supports an Anosov flow, then the number of conjugacy classes in the fundamental group of $M$ grows exponentially fast with the length of the shortest orbit representative, hereby answering a question raised by Plante and Thurston in 1972. In fact we show that, when the flow is transitive, the exponential growth rate is exactly the topological entropy of the flow. We also show that taking only the shortest orbit representatives in each conjugacy classes still yields Bowen's version of the measure of maximal entropy. These results ar…
Locally homogeneous Axiom A flows I: projective Anosov subgroups and exponential mixing
本文通过构造非空间断域，证明无挠射影 Anosov 子群是具有唯一基本双曲集的局部齐次切触 Axiom A 流的单值群，并利用谱估计和亚纯延拓结果建立了指数混合等动力学性质。
Finite Periodic Data Rigidity For Two-Dimensional Area-Preserving Anosov Diffeomorphisms
本文研究二维环面上保面积Anosov微分同胚的有限周期Jacobian数据刚性，通过加权holonomy构造与Bowen等分布的一致有效版本，证明大周期数据匹配可推出指数级近似光滑共轭。
Anosov groups: local mixing, counting, and equidistribution
本文研究了连通半单实代数群中 Anosov 子群的矩阵系数渐近行为，引入了 Burger-Robin 测度的高秩类比，并应用于仿射对称空间中离散轨道的双扇区计数。
Infinitely many graph manifolds with unique geometrical piece that admit arbitrarily many Anosov flows
本文证明存在无穷多仅含一个几何块的图流形，每个可容许任意多个两两不等价的传递Anosov流，其构造方法与此前基于粘合测地流的方式完全不同。
A Hofer-like Metric on the Space of Anosov Flows
本文在Anosov向量场空间上构造Hofer型度量，证明其完备性并用于定量稳定性分析，连接线性响应并引入拓扑Anosov流，为Anosov动力学研究提供几何框架。
Critical axis of Ruelle resonances for Anosov flow with a potential
本研究结合微局部分析与维数理论，研究带光滑实值势的Anosov流的最大实部共振，揭示其与Climenhaga提出的稳定流形上特殊测度族的关联，建立共振存在性与平衡测度混合性质的联系并实现测度的谱重构。
The Livšic equation on differential forms over Anosov flows and applications
本文研究Anosov流上微分形式Livšic方程的可解性，证明非对称条件下中间阶方程在连续范畴中唯一可解，并应用于保体积非对称Anosov流，给出其强丛和唯一可积与拓扑共轭于Anosov微分同胚悬挂流的等价刻画。
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。
A Smooth Autonomous Flow with Exponential Mixing on the Three-Torus
该研究在三维环面上构造了具指数混合性质的光滑自治散度为零的向量场，解答了相关公开问题，通过外科手术从Anosov悬挂流得到目标向量场，还证明了保持指数混合的转移定理。
Oseledets regularity functions quantify the deviation of the growth associated with a dynamical system along its Lyapunov bundles from the corresponding uniform exponential growth. Precise degree of regularity of these functions is unknown. We show that for every invariant Lyapunov bundle of a volume preserving Anosov flow on a closed smooth Riemannian manifold, the corresponding Oseledets regularity functions are in $L^p(m)$, for some $p > 0$, where $m$ is the probability measure defined by the volume form. We prove an analogous result for essentially bounded cocycles over volume preserving A…
Combining microlocal methods and a cohomological theory developped by J. Taylor, we define for $\mathbb{R}^κ$-Anosov actions a notion of joint Ruelle resonance spectrum. We prove that these Ruelle-Taylor resonances fit into a Fredholm theory, are intrinsic and form a discrete subset of $\mathbb{C}^κ$, with $λ=0$ being always a leading resonance. The joint resonant states at $0$ give rise to some new measures of SRB type and the mixing properties of these measures are related to the existence of purely imaginary resonances. The spectral theory developed in this article applies in particular to …
We show that on any smooth compact connected manifold of dimension $m\geq 2$ admitting a smooth non-trivial circle action $\mathcal{S} = \left\{S_t\right\}_{t \in \mathbb{R}}$, $S_{t+1}=S_t$, the set of weakly mixing $C^{\infty}$-diffeomorphisms which preserve both a smooth volume $ν$ and a measurable Riemannian metric is dense in $\mathcal{A}_α \left(M\right)= \overline{ \left\{h \circ S_α \circ h^{-1} : h \in \text{Diff}^{\infty}\left(M, ν\right) \right\}}^{C^{\infty}}$ for every Liouvillean number $α$. The proof is based on a quantitative version of the Anosov-Katok-method with explicitly c…
Isometric extensions of Anosov flows via microlocal analysis
本文利用 Pollicott-Ruelle 共振的微局部框架重新审视了保体积 Anosov 流等距扩张的遍历性与混合性质，并应用于证明负曲率 Riemannian 流形上标架流的遍历性。
Regularity of Manhattan manifolds and exact dimensionality for relatively Anosov groups
研究相对阿诺索夫群的帕特森 - 沙利文测度，利用动态方法，证明其相对于特定视觉度量是精确维数的，曼哈顿流形是\(C^1\) - 正则的，增长指标有相应性质，扩展了阿诺索夫表示的相关结论。
We study dynamical properties of automorphisms of compact nilmanifolds and prove that every ergodic automorphism is exponentially mixing and exponentially mixing of higher orders. This allows to establish probabilistic limit theorems and regularity of solutions of the cohomological equation for such automorphisms. Our method is based on the quantitative equidistribution results for polynomial maps combined with Diophantine estimates.
Let $f$ be a $C^{1+α}$ diffeomorphism of a compact manifold $M$ preserving a smooth measure $μ$. We show that if $f:(M,μ)\to (M,μ)$ is exponentially mixing then it is Bernoulli.
Exponentially mixing SRB measures are Bernoulli
本文证明了紧流形上C^{1+α}微分同胚所保持的SRB测度，若具有指数混合性或由指数体积极限得到，则该测度必为伯努利测度。
Non-monotonic velocity profiles are an inherent feature of mixing flows obeying non-slip boundary conditions. There are, however, few known models of laminar mixing which incorporate this feature and have proven mixing properties. Here we present such a model, alternating between two non-monotonic shear flows which act in orthogonal (i.e. perpendicular) directions. Each shear is defined by an independent variable, giving a two-dimensional parameter space within which we prove the mixing property over open subsets. Within these mixing windows, we use results from the billiards literature to est…
Aperiodic and linearly repetitive Lorentz gases of finite horizon are not exponentially mixing
该研究证明有限视界的非周期线性重复 Lorentz 气体对任意 Hölder 可观测量均无指数或拉伸指数混合，并给出依赖 α 的多项式混合速度界。
Let $f: [0,1]\times [0,1] \setminus {1/2} \to [0,1]\times [0,1]$ be the $C^\infty$ endomorphism given by $$f(x,y)=(2x- [2x], y+ c/|x-1/2|- [y+ c/|x-1/2|]),$$ where $c$ is a positive real number. We prove that $f$ is topologically mixing and if $c>1/4$ then $f$ is mixing with respect to Lebesgue measure. Furthermore we prove that the speed of mixing is exponential.
We consider the Teichmuller flow on the unit cotangent bundle of the moduli space of compact Riemann surfaces with punctures. We show that it is exponentially mixing for the Ratner class of observables. More generally, this result holds for the restriction of the Teichmuller flow to an arbitrary connected component of stratum. This result generalizes [AGY] which considered the case of strata of squares.
Countable Markov shifts with exponential mixing
本文针对可数马尔可夫移位上的势，给出其强正递归性与相关性指数衰减等价的一组条件，并通过量化移位在边界处的行为完成证明，揭示了两者的等价关系。
The aim of this paper is to establish exponential mixing of frame flow for the measure of maximal entropy on a convex cocompact hyperbolic manifold. Consequences include results on the decay of matrix coefficients and on effective equidistribution of holonomies. The main technical point is a spectral bound on certain twisted transfer operators, which we obtain by building on Dolgopyat's framework. This extends and strengthens earlier work of Dolgopyat, Stoyanov, Pollicott, and others.
Strong Positive recurrence for potential and exponential mixing of equilibrium states of surface diffeomorphisms
本文研究了具有正熵的表面微分同胚的大类势能的强正回复性，并建立了平衡态的指数衰减相关函数和有效内在遍历性。
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