Slobodan N. Simić
We show that every volume preserving codimension one Anosov flow on a closed Riemannian manifold of dimension greater than three admits a global cross section and is therefore topologically conjugate to a suspension of a linear toral automorphism. This proves a conjecture of Verjovsky from the 1970's in the volume preserving case.
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Codimension-one holomorphic Anosov diffeomorphisms
本文证明紧连通复流形上的余维一全纯Anosov微分同胚必双全纯共轭于复环面的双曲自同构，验证了Ghys猜想在余维一及复三维情形。
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 show that any topologically transitive codimension-one Anosov flow on a closed manifold is topologically equivalent to a smooth Anosov flow that preserves a smooth volume. By a classical theorem due to Verjovsky, any higher dimensional codimension-one Anosov flow is topologically transitive. Recently, Simic showed that any higher dimensional codimension-one Anosov flow that preserves a smooth volume is topologically equivalent to the suspension of an Anosov diffeomorphism. Therefore, our result gives a complete classification of codimension-one Anosov flow up to topological equivalence in h…
Anosov actions: minimality of foliations or suspension action
本文证明了紧致流形上正则子锥传递的 R^k 的 Anosov 作用满足二分法：稳定与不稳定叶均稠密，或拓扑共轭于 Z^k-Anosov 作用的悬浮，推进了 Verjovsky 扩展猜想。
In this paper, we define codimension one Anosov actions of $\RR^k, k\geq 2,$ on a closed connected orientable manifold $M$. We prove that if the ambient manifold has dimension greater than $k+2$, then the action is topologically transitive. This generalizes a result of Verjovsky for codimension one Anosov flows.
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…
Almost equivalence of suspension Anosov flows
本文通过构造 genus 一的 Birkhoff 截面，证明了由正迹超几何矩阵生成的悬吊阿诺索夫流之间几乎等价，并给出了距离的显式界。
Exotic codimension one Anosov flows
本文在闭双曲三维流形上的某些圆丛中构造了外斯阿诺夫流，构造了Verjovsky猜想的反例，并利用伪外斯阿诺夫拟测地流相关的Cannon-Thurston映射，得到了某些四维流形上无穷多个轨道不等价的外斯阿诺夫流。
In this paper, we consider codimension one Anosov actions of IR^k, k ? 1, on closed connected orientable manifolds of dimension n+k with n? 3. We show that the fundamental group of the ambient manifold is solvable if and only if the weak foliation of codimension one is transversely affine. We also study the situation where one 1-parameter subgroup of IR^k admits a cross-section, and compare this to the case where the whole action is transverse to a fibration over a manifold of dimension n. As a byproduct, generalizing a Theorem by Ghys in the case k=1, we show that, under some assumptions abou…
In this paper we classify algebraic Anosov actions of nilpotent Lie groups on closed manifolds, extending the previous results by P. Tomter. We show that they are all nil-suspensions over either suspensions of Anosov actions of Z^k on nilmanifolds, or (modified) Weyl chamber actions. We check the validity of the generalized Verjovsky conjecture in this algebraic context. We also point out an intimate relation between algebraic Anosov actions and Cartan subalgebras in general real Lie groups.
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 hyperbolic dynamics, a well-known result is that every hyperbolic attracting set, have a finite pseudo-orbit tracing property (FPOTP). It's natural to wonder if this result is maintained in the sectional-hyperbolic dynamics; Komuro in [Lorenz attractors do not have the pseudo-orbit tracing property], provides a negative answer for this question, by proving that the geometric Lorenz Attractor doesn't have a FPOTP. In this paper, we generalized the result of Komuro, we prove that every codimension one sectional-hyperbolic attractor set with a unique singularity Lorenz-like, which is of bounda…
We consider the class of partially hyperbolic diffeomorphisms $f:M\to M$ obtained as the discretization of topological Anosov flows. We show uniqueness of minimal unstable lamination for these systems provided that the underlying Anosov flow is transitive and not orbit equivalent to a suspension. As a consequence, uniqueness of quasi-attractors is obtained. If the underlying Anosov flow is not transitive we get an analogous finiteness result provided that the restriction of the flow to any of its attracting basic pieces is not a suspension. A similar uniqueness result is also obtained for cert…
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 …
From pseudo-Anosov flows on graph manifolds to totally periodic flows
研究显示图流形上的伪Anosov流可通过构造部分Birkhoff截面，几乎等价于完全周期性伪Anosov流或悬垂Anosov流，结合先前工作证明图流形上的Transitive Anosov流几乎等价于悬垂Anosov流。
An obstruction to fiberwise Anosov flows over 3-dimensional Anosov flows
该研究探讨了三维Anosov流作为纤维化Anosov流基流的障碍，证明了基流在特定条件下不存在，并推导出相关流的轨道等价性。
We consider the Lagrange and the Markov dynamical spectra associated with a conservative Anosov flow on a compact manifold of dimension $3$ (including geodesic flows of negative curvature and suspension flows). We show that for a large set of real functions and typical conservative Anosov flows, both the Lagrange and Markov dynamical spectra have a non-empty interior.
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。
Infinitely many closed paths in the graph of Anosov flows
研究Anosov流在闭3流形上通过非平凡Fried手术生成等价流的问题，证明某些悬吊Anosov流存在无限多对周期轨道满足此性质。
This paper is devoted to higher dimensional Anosov flows and consists of two parts. In the first part, we investigate fiberwise Anosov flows on affine torus bundles which fiber over 3-dimensional Anosov flows. We provide a dichotomy result for such flows --- they are either suspensions of Anosov diffeomorphisms or the stable and unstable distributions have equal dimensions. In the second part, we give a new surgery type construction of Anosov flows, which yields non-transitive Anosov flows in all odd dimensions.
Quasigeodesic behavior of flow lines is a very useful property in the study of Anosov flows. Not every Anosov flow in dimension three is quasigeodesic. In fact up to orbit equivalence, the only previously known examples of quasigeodesic Anosov flows were suspension flows. In this article, we prove that a new class of examples are quasigeodesic. These are the first examples of quasigeodesic Anosov flows on three manifolds that are neither Seifert, nor solvable, nor hyperbolic. In general, it is very hard to show that a given flow in quasigeodesic, and in this article we provide a new method to …
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。
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 every codimension one partially hyperbolic diffeomorphism must support on $\mathbb{T}^{n}$. It is locally uniquely integrable and derived from a linear codimension one Anosov diffeomorphism. Moreover, this system is intrinsically ergodic, and the A. Katok's conjecture about the existence of ergodic measures with intermediate entropies holds for it.
Despite the invertible setting, Anosov endomorphisms may have infinitely many unstable directions. Here we prove, under transitivity assumption, that an Anosov endomorphism on a closed manifold $M,$ is either special (that is, every $x \in M$ has only one unstable direction) or for a typical point in $M$ there are infinitely many unstable directions. Other result of this work is the semi rigidity of the unstable Lyapunov exponent of a $C^{1+α}$ codimension one Anosov endomorphism and $C^1$ close to a linear endomorphism of $\mathbb{T}^n$ for $(n \geq 2).$ In the appendix we give a proof for er…
Two flows are topologically almost commensurable if, up to removing finitely many periodic orbits and taking finite coverings, they are topologically equivalent. We prove that all suspensions of automorphisms of the 2-dimensional torus and all geodesic flows on unit tangent bundles to hyperbolic 2-orbifolds are pairwise almost commensurable.
We classify five dimensional Anosov flows with smooth decomposition which are in addition transversely symplectic. Up to finite covers and a special time change, we find exectly the suspensions of symplectic hyperbolic automorphisms of four dimensional toris, and the geodesic flows of three dimensional hyperbolic manifolds.
Proof of the Verjovsky Conjecture
本文证明了Verjovsky猜想，即维数大于三流形上的余维一Anosov流均拓扑等价于双曲环面自同构的悬挂流，并借助时间变换下的联合可积性给出更一般的推导。
We show that if $Λ$ is a codimension-one hyperbolic attractor for a $C^r$ diffeomorphism $f$, where $2\leq r\leq \infty$, and $f$ is not Anosov, then there is a neighborhood $\mathcal{U}$ of $f$ in $\mathrm{Diff}^r(M)$ and an open and dense set $\mathcal{V}$ of $\mathcal{U}$ such that any $g\in\mathcal{V}$ has a trivial centralizer on the basin of attraction for $Λ$.
We consider Anosov actions of a Lie group $G$ of dimension $k$ on a closed manifold of dimension $k+n.$We introduce the notion of Nil-Anosov action of $G$ (which includes the case where $G$ is nilpotent) and establishes the invariance by the entire group $G$of the associated stable and unstable foliations. We then prove a spectral decomposition Theoremfor such an action when the group $G$ is nilpotent. Finally, we focus on the case where $G$ is nilpotent andthe unstable bundle has codimension one. We prove that in this case the action is a Nil-extensionover an Anosov action of an abelian Lie g…
On global rigidity of transversely holomorphic Anosov flows
本文研究了横向全纯Anosov流的全局刚性，证明了其在特定条件下可积分到复流形，并给出了拓扑transitive流的轨道等价结果。
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…
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。
Transitive Anosov flows on non-compact manifolds
本文研究非紧三维流形上Anosov流的传递性，给出同调条件保证传递流在无限覆盖中的传递性，并构造满足悬垂流同伦刻画的传递流，回答相关问题的流版本。
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…
The purpose of this paper is to classify Anosov flows on the 3-manifolds obtained by Dehn surgeries on the figure-eight knot. This set of 3-manifolds is denoted by M(r) (r is a ratioanl number), which contains the first class of hyperbolic 3-manifolds admitting Anosov flows in history, discovered by Goodman. Combining with the classification of Anosov flows on the sol-manifold M(0) due to Plante, we have: 1. if r is an integer, up to topological equivalence, M(r) exactly carries a unique Anosov flow, which is constructed by Goodman by doing a Dehn-Fried-Goodman surgery on a suspension Anosov f…
We first prove rigidity results for pseudo-Anosov flows in prototypes of toroidal 3-manifolds: we show that a pseudo-Anosov flow in a Seifert fibered manifold is up to finite covers topologically equivalent to a geodesic flow and we show that a pseudo-Anosov flow in a solv manifold is topologically equivalent to a suspension Anosov flow. Then we study the interaction of a general pseudo-Anosov flow with possible Seifert fibered pieces in the torus decomposition: if the fiber is associated with a periodic orbit of the flow, we show that there is a standard and very simple form for the flow in t…
In this article we study the topological structure of the lifts to the universal of the stable and unstable foliations of $3$-dimensional Anosov flows. In particular we consider the case when these foliations do not have Hausdorff leaf space. We completely determine the structure of the set of non separated leaves from a given leaf in one of these foliations. As a consequence of this suspensions are characterized, up to topological conjugacy, as the only $3$-dimensional Anosov flows without freely homotopic closed orbits. Furthermore the structure of branching is related to the topology of the…
Hyperbolicity of complements of orbits in Anosov flows
该研究证明三维Anosov流在满足稳定与不稳定叶状结构可定向时，其满周期轨道补集为双曲流形，还明确了可定向条件的必要性，并给出悬挂流与测地流的相关结果。
Transverse surfaces and pseudo-Anosov flows
本文刻画了传递伪阿诺索夫流下的（几乎）横截曲面，证明了无完美契合时瑟斯顿范数最小化曲面几乎横截，并回答了Cooper-Long-Reid的问题。
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。
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 smooth Anosov flow on a closed oriented three manifold $M$ gives rise to a Liouville structure on the four manifold $[-1,1]\times M$ which is not Weinstein, by a construction of Mitsumatsu and Hozoori. We call it the associated Anosov Liouville domain. It is well defined up to homotopy and only depends on the homotopy class of the original Anosov flow; its symplectic invariants are then invariants of the flow. We study the symplectic geometry of Anosov Liouville domains, via the wrapped Fukaya category, which we expect to be a powerful invariant of Anosov flows. The Lagrangian cylinders over…
Strong symbolic dynamics for geodesic flow on CAT(-1) spaces and other metric Anosov flows
该研究证明紧致或凸余紧局部CAT(-1)空间上的测地流可通过带Hölder屋顶函数的不可约有限型移位悬挂流编码，且其技术可推广到射影Anosov表示的测地流，还得到了关于平衡测度的强动力学结果。
Endperiodic maps via pseudo-Anosov flows
本研究逆转Thurston的经典构造，证明无限型曲面的无环面端周期映射可由纤维化双曲3-流形的深度一叶状结构得到，恢复Handel-Miller层状结构，推广有限亏格下的熵相关关系，并刻画Cantwell-Conlon叶状锥及证明其上熵函数的连续凸性。
To any Anosov flow X on a 3-manifold Fe1 associated a bi-foliated plane (a plane endowed with two transverse foliations Fs and Fu) which reflects the normal structure of the flow endowed with the center-stable and center unstable foliations. A flow is R-covered if Fs (or Fu) is trivial. From one Anosov flow one can build infinitely many others by Dehn-Goodman-Fried surgeries. This paper investigates how these surgeries modify the bi-foliated plane. We first noticed that surgeries along some specific periodic orbits do not modify the bi-foliated plane: for instance, - surgeries on families of o…
We adapt to $C^r$ Anosov flows on compact manifolds a construction for $C^r$ discrete-time hyperbolic dynamics ($r>1$), obtaining anisotropic Banach or Hilbert spaces on which the resolvent of the generator of weighted transfer operators for the flow is quasi-compact. We apply this to study the ergodic integrals of the horocycle flows $h_ρ$ of $C^r$ codimension one mixing Anosov flows. In dimension three, for any suitably bunched $C^3$ contact Anosov flow with orientable strong-stable distribution, we establish power-law convergence of the ergodic average. We thereby implement the program of G…
Given a general pseudo-Anosov flow in a three manifold, the orbit space of the lifted flow to the universal cover is homeomorphic to an open disk. We compactify this orbit space with an ideal circle boundary. If there are no perfect fits between stable and unstable leaves and the flow is not topologically conjugate to a suspension Anosov flow, we then show: The ideal circle of the orbit space has a natural quotient space which is a sphere and is a dynamical systems ideal boundary for a compactification of the universal cover of the manifold. The main result is that the fundamental group acts o…
Global Rigidity of Codimension One Actions
本文研究了高秩简单分裂李群在闭流形上的codimension 一作用的全局刚性，通过联合积分论证稳定和中心不稳定Pesin流形，证明了此类作用的等价性或覆盖性。
The paper gives first quantitative estimates on the modulus of continuity of the spectral measure for weak mixing suspension flows over substitution automorphisms, which yield information about the "fractal" structure of these measures. The main results are, first, a Hoelder estimate for the spectral measure of almost all suspension flows with a piecewise constant roof function; second, a log-Hoelder estimate for self-similar suspension flows; and, third, a Hoelder asymptotic expansion of the spectral measure at zero for such flows. Our second result implies log-Hoelder estimates for the spect…
Ergodic dichotomy for subspace flows in higher rank
本文研究高秩子空间流的遍历性，提出类似 Hopf-Tsuji-Sullivan 二分性的判据，并推广到任意维数连通对角子群，为一般 Anosov 子群建立余维数二分性，推广了 Burger-Landesberg-Lee-Oh 的工作。
Heegaard Floer theory and pseudo-Anosov flows II: Differential and Fried pants
本文利用伪 Anosov 流链环补空间的特殊 Heegaard 图，加细 $\text{spin}^\text{c}$ 分次并刻画不可约多轨道子复形，证明其同调一维，并推出悬挂流次高缝合 Floer 群计数最小周期点。
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。
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