Yong Fang
We study the cohomological pressure introduced by R.Sharp (defined by using topological pressures of certain potentials of Anosov flows). In particular, we get the rigidity in the case that this pressure coincides with the metrical entropy, generalising related rigidity results of A.Katok and P. Foulon.
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We show that all $C^\infty$ Anosov $Z^r$-actions on tori and nilmanifolds without rank-one factor actions are, up to $C^\infty$ conjugacy, actions by automorphisms.
In this paper we obtain local rigidity results for linear Anosov diffeomorphisms in terms of Lyapunov exponents. More specifically, we show that given an irreducible linear hyperbolic automorphism $L$ with simple real eigenvalues with distinct absolute values, any small perturbation preserving the volume and with the same Lyapunov exponents is smoothly conjugate to $L$. We also obtain rigidity results for skew products over Anosov diffeomorphisms. Given a volume preserving partially hyperbolic skew product diffeomorphism $f_0$ over an Anosov automorphism of the 2-torus, we show that for any vo…
Rigidity from the strong unstable foliation for higher-dimensional Anosov and partially hyperbolic flows
本文推广Burniol Clotet的刚性结果至高维Anosov流及其紧致李群等距扩张，证明强不稳定叶理等价蕴含时间重标度共轭。
Using the factorization method, a method pioneered by Eskin and Mirzakhani in their groundbreaking work about measure classification over the moduli space of translation surfaces, we show that generalized $u$-Gibbs states over quantitatively non-integrable Anosov systems are absolutely continuous with respect to the whole unstable manifold.
In this paper, we study the centralizer of a partially hyperbolic diffeomorphism on $\mathbb{T}^3$ which is homotopic to an Anosov automorphism, and we show that either its centralizer is virtually trivial or such diffeomorphism is smoothly conjugate to its linear part.
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.
We obtain smooth conjugacy between non-necessarily special Anosov endomorphisms in the conservative case. Among other results, we prove that a strongly special $C^{\infty}-$Anosov endomorphism of $\mathbb{T}^2$ and its linearization are smoothly conjugated since they have the same periodic data. Assuming that for a strongly special $C^{\infty}-$Anosov endomorphism of $\mathbb{T}^2$ every point is regular (in Oseledec's Theorem sense), then we obtain again smooth conjugacy with its linearization. We also obtain some results on local rigidity of linear Anosov endomorphisms of $d-$torus, where $d…
Dominated splitting from constant periodic data and global rigidity of Anosov automorphisms
本文研究双曲系统上 GL(d,R) 上循环的支配分裂判据，并据此证明一般环面 Anosov 自同构及邻近某些非线性 Anosov 微分同胚的全局周期数据刚性。
We introduce the matching functions technique in the setting of Anosov flows. Then we observe that simple periodic cycle functionals (also known as temporal distance functions) provide a source of matching functions for conjugate Anosov flows. For conservative codimension one Anosov flows $φ^t\colon M\to M$, $\dim M\ge 4$, these simple periodic cycle functionals are $C^1$ regular and, hence, can be used to improve regularity of the conjugacy. Specifically, we prove that a continuous conjugacy must, in fact, be a $C^1$ diffeomorphism for an open and dense set of codimension one conservative Ano…
Periodic data rigidity of Anosov automorphisms with Jordan blocks
本文证明带 Jordan 块的 Anosov 自同构不满足周期数据刚性，并提出精细化周期数据，用以刻画四维环面上此类系统的 $C^{1+}$ 共轭。
We consider Anosov diffeomorphisms on $\mathbb{T}^3$ such that the tangent bundle splits into three subbundles $E^s_f \oplus E^{wu}_f \oplus E^{su}_f.$ We show that if $f$ is $C^r, r \geq 2,$ volume preserving, then $f$ is $C^1$ conjugated with its linear part $A$ if and only if the center foliation $\mathcal{F}^{wu}_f$ is absolutely continuous and the equality $λ^{wu}_f(x) = λ^{wu}_A,$ between center Lyapunov exponents of $f$ and $A,$ holds for $m$ a.e. $x \in \mathbb{T}^3.$ We also conclude rigidity of derived from Anosov diffeomorphism, assuming an strong absolute continuity property (Unifo…
Rigidity of center Lyapunov exponents for Anosov diffeomorphisms on 3-torus
该研究针对3-环面上具三子束部分双曲分裂的Anosov微分同胚，证明若两微分同胚共轭且共轭保持强稳定叶状结构，则对应周期点的中心Lyapunov指数相等，给出已有结果的逆命题，并将结论推广至由Anosov导出的部分双曲微分同胚。
Lyapunov spectrum rigidity and simultaneous linearization for random Anosov diffeomorphisms
本文研究了随机阿诺索夫微分同胚的李雅普诺夫谱刚性，证明了在特定条件下系统可同时线性化，并探讨了正矩阵随机游走的正李雅普诺夫指数刚性。
We classify quasiconformal Anosov flows whose strong stable and unstable distributions are at least two dimensional and the sum of these two distributions is smooth. We deduce from this classification result the complete classification of volume-preserving quasiconformal diffeomorphisms whose stable and unstable distributions are at least two dimensional. Our central idea is to take a good time change so that perodic orbits are equi-distributed with respect to a lebesgue measure.
We establish a strong form of local rigidity for hyperbolic automorphisms of the 3-torus with real spectrum. Namely, let $L\colon\mathbb T^3\to\mathbb T^3$ be a hyperbolic automorphism of the 3-torus with real spectrum and let $f$ be a $C^1$ small perturbation of $L$. Then $f$ is smoothly ($C^\infty$) conjugate to $L$ if and only if obstructions to $C^1$ conjugacy given by the eigenvalues at periodic points of $f$ vanish. By combining our result and a local rigidity result of Kalinin and Sadovskaya for conformal automorphisms this completes the local rigidity program for hyperbolic automorphis…
We consider an irreducible Anosov automorphism L of a torus T^d such that no three eigenvalues have the same modulus. We show that L is locally rigid, that is, L is C^1 conjugate to any C^1-small perturbation f with the same periodic data. We also prove that toral automorphisms satisfying these assumptions are generic in SL(d,Z). Examples constructed in the Appendix by Rafael de la Llave show importance of the assumption on the eigenvalues.
Smooth rigidity for 3-dimensional dissipative Anosov flows
本文证明三维耗散Anosov流在连续共轭下，除例外情形外，共轭或光滑或交换正负SRB测度，并由此建立局部刚性、改进经典定理并揭示Teichmüller空间的分层结构。
Rigidity phenomena for time changes of products of Anosov flows
研究Anosov流乘积的时间变换的刚性，证明具有相同周期轨道稳定子的时间变换共轭于自同构，以及若周期轨道稳定子可同时对角化则时间变换共轭于流乘积，并应用于3维流形上的C^1时间变换。
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…
Symplecto-rigidity and bootstrap for Anosov symplectomorphisms and contact Anosov flows
本文通过自举提升2-捏合接触Anosov流的共轭正则性，引入辛刚性概念，并证明de la Llave例子在Anosov辛同胚空间中具有刚性，从而建立一系列光滑刚性结果。
Anosov Endomorphisms on the 2-torus: Regularity of foliations and rigidity
本文研究二维环面上Anosov自同态的光滑共轭，通过叶层正则性给出充分条件，并刻画了特殊自同态与其线性化的共轭关系。
Smooth rigidity for very non-algebraic Anosov diffeomorphisms of codimension one
该研究提出基于匹配函数的Anosov微分同胚光滑刚性新方法，证明三维环面线性双曲自同构小邻域内极非代数余维一Anosov微分同胚光滑共轭等价于雅可比周期数据匹配，并推广至高维情形。
In this paper, we prove that for $\mathcal{C}^1$ generic volume-preserving Anosov diffeomorphisms of a compact Riemannian manifold, Livšic measurable rigidity theorem holds. We also prove that for $\mathcal{C}^1$ generic volume-preserving Anosov flows of a compact Riemannian manifold, Livšic measurable rigidity theorem holds.
Rigidity of Lyapunov exponents for derived from Anosov diffeomorphisms
本文研究同伦于线性 Anosov 自同构的保体积部分双曲微分同胚，证明其 Lyapunov 指数和受线性化界约束，涵盖 DA 与非一致双曲系统。
Local smooth rigidity of Anosov diffeomorphisms in $\mathbb{T}^{3}$
研究在 $\mathbb{T}^{3}$ 上的 Anosov diffeomorphisms 之间 $C^0 $ 共轭时，若周期数据匹配则共轭必为光滑的性质。
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.
Let $f$ be a conservative partially hyperbolic diffeomorphism, which is homotopic to an Anosov automorphism $A$ on $\mathbb{T}^3$. We show that the stable and unstable bundles of $f$ are jointly integrable if and only if every periodic point of $f$ admits the same center Lyapunov exponent with $A$. In particular, $f$ is Anosov. Thus every conservative partially hyperbolic diffeomorphism, which is homotopic to an Anosov automorphism on $\mathbb{T}^3$, is ergodic. This proves the Ergodic Conjecture proposed by Hertz-Hertz-Ures on $\mathbb{T}^3$.
In this article we prove global rigidity results for hyperbolic actions of higher-rank lattices. Suppose $Γ$ is a lattice in semisimple Lie group, all of whose factors have rank $2$ or higher. Let $α$ be a smooth $Γ$-action on a compact nilmanifold $M$ that lifts to an action on the universal cover. If the linear data $ρ$ of $α$ contains a hyperbolic element, then there is a continuous semiconjugacy intertwining the actions of $α$ and $ρ$, on a finite-index subgroup of $Γ$. If $α$ is a $C^\infty$ action and contains an Anosov element, then the semiconjugacy is a $C^\infty$ conjugacy. As a coro…
Rigidity of stable Lyapunov exponents and integrability for Anosov maps
本文研究了环面上不可约 Anosov 映射的稳定 Lyapunov 指数刚性与可积性，证明了一维及特定高维稳定丛下可积性与 Lyapunov 指数相等的等价关系，并得出拓扑共轭在稳定丛上光滑的结论。
The original proof has a gap, and need extra hypothesis that the strong stable and strong unstable filiation both to be $C^1$. The argument is like the following: with the regularity, one can show that the weak-stable and weak-unstable foliation both to be $C^{1+Lip}$, and then following the same argument as in the paper one can conclude the proof. But this extra hypothesis seems implying that the flow has a contact structure. Then it will be only a result which improves the Foulon's proof on contract structure for $C^\infty$ regularity to $C^2$, not so interest.
A foliation is R-covered if the leaf space in the universal cover is homeomorphic to the real numbers. We show that, up to topological conjugacy, there are at most two pseudo-Anosov flows transverse to such a foliation. If there are two, then the foliation is weakly conjugate to the the stable foliation of an R-covered Anosov flow. The proof uses the universal circle to R-covered foliations.
In this work we completely classify $C^\infty$ conjugacy for conservative partially hyperbolic diffeomorphisms homotopic to a linear Anosov automorphism on the 3-torus by its center foliation behavior. We prove that the uniform version of absolute continuity for the center foliation is the natural hypothesis to obtain $C^\infty$ conjugacy to its linear Anosov automorphism. On a recent work Avila, Viana and Wilkinson proved that for a perturbation in the volume preserving case of the time-one map of an Anosov flow absolute continuity of the center foliation implies smooth rigidity. The absolute…
Smooth rigidity for 3-dimensional volume preserving Anosov flows and weighted marked length spectrum rigidity
研究三维保体积阿诺索夫流，证明若两流拓扑共轭则共轭光滑，除非为常屋顶悬挂流；并推出曲面负曲率加权标记长度谱刚性等新结果。
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。
We consider a totally nonsymplectic Anosov action of Z^k which is either uniformly quasiconformal or pinched on each coarse Lyapunov distribution. We show that such an action on a torus is C^\infty--conjugate to an action by affine automorphisms. We also obtain similar global rigidity results for actions on an arbitrary compact manifold assuming that the coarse Lyapunov foliations are jointly integrable.
We consider an optical hypersurface $Σ$ in the cotangent bundle $τ:T^*M\to M$ of a closed manifold $M$ endowed with a twisted symplectic structure. We show that if the characteristic foliation of $Σ$ is Anosov, then a smooth 1-form $θ$ on $M$ is exact if and only $τ^*θ$ has zero integral over every closed characteristic of $Σ$. This result is derived from a related theorem about magnetic flows which generalizes our work in \cite{DP}. Other rigidity issues are also discussed.
The goal of this paper is to study ergodic and rigidity properties of smooth actions of the discrete Heisenberg group $\H$. We establish the decomposition of the tangent space of any $C^\infty$ compact Riemannian manifold $M$ for Lyapunov exponents, and show that all Lyapunov exponents for the center elements are zero. We obtain that if an $\H$ group action contains an Anosov element, then under certain conditions on the element, the center elements are of finite order. In particular there is no faithful codimensional one Anosov Heisenberg group action on any manifolds, and no faithful codimen…
The first half of this paper is concerned with the topology of the space $\AAA(M)$ of (not necessarily contact) Anosov vector fields on the unit tangent bundle $M$ of closed oriented hyperbolic surfaces $Σ$. We show that there are countably infinite connected components of $\AAA(M)$, each of which is not simply connected. In the second part, we study contact Anosov flows. We show in particular that the time changes of contact Anosov flows form a $C^1$-open subset of the space of the Anosov flows which leave a particular $C^\infty$ volume form invariant, if the ambiant manifold is a rational ho…
Semi-conjugacy rigidity for endomorphisms derived from Anosov on the 2-torus
研究2-环面上由非扩张Anosov自映射导出的非可逆部分双曲自映射的半共轭刚性，证明了存在部分双曲分裂当且仅当半共轭于线性化，并进一步讨论了不同子丛条件下的共轭性质与Lyapunov指数刚性。
We provide a general argument for the failure of Anosov-Katok-like constructions (as in \cite{AFKo2015} and \cite{NKInvDist}) to produce Cohomologically Rigid diffeomorphisms in manifolds other than tori. A $C^{\infty }$ smooth diffeomorphism $f $ of a compact manifold $M$ is Cohomologically Rigid iff the equation, known as Linear Cohomological one, \begin{equation*} ψ\circ f - ψ= φ\end{equation*} admits a $C^{\infty }$ smooth solution $ψ$ for every $φ$ in a codimension $1$ closed subspace of $C^{\infty } (M, \mathbb{C} )$. As an application, we show that no Cohomologically Rigid diffeomorphis…
Rigidity of $\mathbf{\textit{U}}$-Gibbs measures near conservative Anosov diffeomorphisms on $\mathbb{T}^3$
本文证明了三维环面上保守 Anosov 微分同胚的 $C^1$ 邻域内，任意 $C^2$ 微分同胚要么强稳定与强不稳定丛联合可积，要么其所有全支撑 $u$-Gibbs 测度均为 SRB 测度。
We show that sufficiently irreducible Anosov actions of higher rank abelian groups on tori and nilmanifolds are smoothly conjugate to affine actions.
In the present work we obtain rigidity results analysing the set of regular points, in the sense of Oseledec's Theorem. It is presented a study on the possibility of an Anosov diffeomorphisms having all Lyapunov exponents defined everywhere. We prove that this condition implies local rigidity of an Anosov automorphism of the torus $\mathbb{T}^d, d \geq 3,$ $C^1-$close to a linear automorphism diagonalizable over $\mathbb{R}$ and such that its characteristic polynomial is irreducible over $\mathbb{Q}.$
Smooth rigidity for higher dimensional contact Anosov flows
本研究将匹配函数技术用于满足聚束假设的高维接触Anosov流，推广了3维刚性结论，证明其C⁰共轭可推出高阶光滑共轭，还可复现实双曲流形的标记长度谱刚性结果。
$C^0$-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。
Marked length spectrum rigidity for Anosov magnetic surfaces
本文证明在闭连通有向曲面上，若两个 Anosov 磁系统具有同一上同调类的磁形式，且由保持体积、同痕于恒同的共轭联系，则其度量必等距，从而将 Guillarmou–Lefeuvre–Paternain 的标记长度谱刚性结果推广到磁系统。
This article considers inverse problems on closed Riemannian surfaces whose geodesic flow is Anosov. We prove spectral rigidity for any Anosov surface and injectivity of the geodesic ray transform on solenoidal 2-tensors. We also establish surjectivity results for the adjoint of the geodesic ray transform on solenoidal tensors. The surjectivity results are of independent interest and imply the existence of many geometric invariant distributions on the unit sphere bundle. In particular, we show that on any Anosov surface $(M,g)$, given a smooth function $f$ on $M$ there is a distribution in the…
Some Rigidity Theorem for Anosov Geodesic Flows
研究完备无共轭点流形上的 Anosov 测地流，证明其收缩常数下界及有限体积情形的曲率刚性，并用于推出双 Lipschitz 与 $C^1$ 共轭结果。
Marked length spectrum rigidity for Anosov surfaces
本文证明了亏格≥2的光滑闭可定向曲面上，具有相同标记长度谱和Anosov测地流的两个度量必通过同位于恒同的等距映射等距，方法结合微局部分析与复曲线几何。
This paper is a survey about recent progress in measure rigidity and global rigidity of Anosov actions, and celebrates the profound contributions by Federico Rodriguez Hertz to rigidity in dynamical systems.
Marked boundary rigidity for surfaces of Anosov type
本文证明 Anosov 型曲面由标记边界距离决定度量，并借助传递原理将闭流形刚性结果推广至开曲面，恢复简单圆盘情形。
Smooth Stable Foliations of Anosov Diffeomorphisms
本文研究 Anosov 微分同胚余维一稳定叶状结构的刚性，证明其正则性略高于 $C^2$ 时即可达到与微分同胚相同的光滑性。
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 $C e^{-cn}$.
For Anosov flows on compact Riemann manifolds we study the rate of decay along the flow of diameters of balls $B^s(x,\ep)$ on local stable manifolds at Lyapunov regular points $x$. We prove that this decay rate is similar for all sufficiently small values of $ε> 0$. From this and the main result in \cite{kn:St1}, we derive strong spectral estimates for Ruelle transfer operators for contact Anosov flows with Lipschitz local stable holonomy maps. These apply in particular to geodesic flows on compact locally symmetric manifolds of strictly negative curvature. As is now well known, such spectral …
In this article we analyze totally periodic pseudo-Anosov flows in graph three manifolds. This means that in each Seifert fibered piece of the torus decomposition, the free homotopy class of regular fibers has a finite power which is also a finite power of the free homotopy class of a closed orbit of the flow. We show that each such flow is topologically equivalent to one of the model pseudo-Anosov flows which we constructed in a previous article. A model pseudo-Anosov flow is obtained by glueing standard neighborhoods of Birkhoff annuli and perhaps doing Dehn surgery on certain orbits. We als…
In this article, we give a quasi-final classification of quasiconformal Anosov flows. We deduce a very interesting differentable rigidity result for the orbit foliations of hyperbolic manifold of dimension at least three.
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。
We show that the differential in positive equivariant symplectic homology or linearized contact homology vanishes for non-degenerate Reeb flows with a continuous invariant Lagrangian subbundle (e.g. Anosov Reeb flows). Several applications are given, including obstructions to the existence of these flows and abundance of periodic orbits for contact forms representing an Anosov contact structure.
For Anosov flows obtained by suspensions of Anosov diffeomorphisms on surfaces, we show the following type of rigidity result: if a topological conjugacy between them is differentiable at a point, then the conjugacy has a smooth extension to the suspended 3-manifold. These result generalize the similar ones of Sullivan and Ferreira-Pinto for 1-dimensional expanding dynamics and also a result of Ferreira-Pinto for 2-dimensional hyperbolic dynamics.
We show that for smooth contact Anosov flows in dimension 3, the resonant states associated to the first band of Ruelle resonances are distributions that are killed by the unstable derivative.
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