Anosov actions of (n-1)-dimensional Lie groups on n-dimensional manifolds

Criterion for quasi-anosovian diffeomorphisms of closed manifolds

Quasi-Anosov diffeomorphism is a kind of important dynamical system due to R. Mane 1970s. In this paper, we present a criterion for such dynamics using ergodic theory.

On manifolds supporting quasi Anosov diffeomorphisms

Let $M$ be an $n$-dimensional manifold supporting a quasi Anosov diffeomorphism. If $n=3$ then either $M={\mathbb T}^3$, in which case the diffeomorphisms is Anosov, or else its fundamental group contains a copy of ${\mathbb Z} ^6$. If $n=4$ then $Π_1(M)$ contains a copy of ${\mathbb Z} ^4$, provided that the diffeomorphism is not Anosov.

Algebraic Anosov actions of Nilpotent Lie groups

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.

图流形上伪Anosov流的粘合唯一性与虚有限性

Uniqueness of gluings and virtual finiteness of pseudo-Anosov flows on graph manifolds

本文刻画了粘合得到的伪Anosov流的轨道等价条件，结合相关描述证明了图流形上可递伪Anosov流有限性猜想的虚版本。

Manifolds with higher homotopy which do not support Anosov diffeomorphisms

We show that various classes of closed manifolds with non-trivial higher homotopy groups do not support (transitive) Anosov diffeomorphisms. In particular we show that a finite product of spheres at least one of which is even-dimensional does not support transitive Anosov diffeomorphisms.

Transitivity of codimension one Anosov actions of R^k on closed manifolds

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.

非紧流形上的传递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。

New Classes of Quasigeodesic Anosov Flows in $3$-Manifolds

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 …

非紧流形中 Anosov 测地流的 Ruelle 不等式与 Pesin 公式

Ruelle's inequality and Pesin's formula for Anosov geodesic flows in non-compact manifolds

本文在曲率满足特定假设的非紧流形上证明了 Anosov 测地流的 Ruelle 不等式，并在有限体积非紧流形上得到了相应的 Pesin 公式。

The space of (contact) Anosov flows on 3-manifolds

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…

Explosion of differentiability for equivalencies between Anosov flows on 3-manifolds

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.

Intransitive sectional-Anosov flows on 3-manifolds

For each $n\in\mathbb{Z}^+$, we show the existence of Venice masks (i.e. intransitive sectional-Anosov flows with dense periodic orbits) containing $n$ equilibria on certain compact 3-manifolds. These examples are characterized because of the maximal invariant set is a finite union of homoclinic classes. Here, the intersection between two different homoclinic classes is contained in the closure of the union of unstable manifolds of the singularities.

Quasi-Anosov diffeomorphisms of 3-manifolds

In 1969, Hirsch posed the following problem: given a diffeomorphism, and a compact invariant hyperbolic set, describe its topology and restricted dynamics. We solve the problem where the hyperbolic invariant set is a closed 3-manifold: if the manifold is orientable, then it is a connected sum of tori and handles; otherwise it is a connected sum of tori and handles quotiented by involutions. The dynamics of the diffeomorphisms restricted to these manifolds, called quasi-Anosov diffeomorphisms, is also classified: it is the connected sum of DA-diffeomorphisms, quotiented by commuting involutions…

Existence of Anosov diffeomorphisms on infra-nilmanifolds modeled on free nilpotent Lie groups

An infra-nilmanifold is a manifold which is constructed as a quotient space $Γ\backslash G$ of a simply connected nilpotent Lie group $G$, where $Γ$ is a discrete group acting properly discontinuously and cocompactly on $G$ via so called affine maps. The manifold $Γ\backslash G$ is said to be modeled on the Lie group $G$. This class of manifolds is conjectured to be the only class of closed manifolds allowing an Anosov diffeomorphism. However, it is far from obvious which of these infra--nilmanifolds actually do admit an Anosov diffeomorphism. In this paper we completely solve this question fo…

具有唯一几何块且容许任意多个Anosov流的无穷多图流形

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。

关于具有伪Anosov吸引子和排斥子的三维流形的同胚

On homeomorphisms of three-dimensional manifolds with pseudo-Anosov attractors and repellers

本文研究带有限曲面吸引/排斥子的三维流形保定向同胚，证明一类伪阿诺索夫型同胚的环境Ω-共轭性及其中中心化子的构成性质。

On the essential hyperbolicity of sectional-Anosov flows

We prove that every sectional-Anosov flow of a compact 3-manifold $M$ exhibits a finite collection of hyperbolic attractors and singularities whose basins form a dense subset of $M$. Applications to the dynamics of sectional-Anosov flows on compact 3-manifolds include a characterization of essential hyperbolicity, sensitivity to the initial conditions (improving \cite{ams}) and a relationship between the topology of the ambient manifold and the denseness of the basin of the singularities.

On classification of higher rank Anosov actions on compact manifold

We prove global smooth classification results for TNS totally Anosov Z^k actions on general compact manifolds, under each one of the following conditions: joint integrability, resonance-free or Lyapunov pinching condition. Unlike the previous results, we do not require any uniform quasiconformality or pinching condition of action elements on coarse Lyapunov distributions, nor do we have any restriction on the dimension of coarse Lyapunov distributions. The main novelty is in proving a new standard form of the derivative cocycle for any TNS totally Anosov Z^k action on general manifold. A main …

Aspherical products which do not support Anosov diffeomorphisms

We show that the product of infranilmanifolds with certain aspherical closed manifolds do not support Anosov diffeomorphisms. As a special case, we obtain that products of a nilmanifold and negatively curved manifolds of dimension at least 3 do not support Anosov diffeomorphisms.

具有 Anosov 测地流的黎曼流形没有共轭点

Riemannian manifolds with Anosov geodesic flow do not have conjugate points

本文证明了具有 Anosov 测地流且曲率有下界的完备非紧黎曼流形不存在共轭点，从而解决了 R. Mañé 提出的开放问题。

Classification of special Anosov endomorphisms of nil-manifolds

In this paper we give a classification of special endomorphisms of nil-manifolds: Let $f:N/Γ\rightarrow N/Γ$ be a covering map of a nil-manifold and denote by $A:N/Γ\rightarrow N/Γ$ the nil-endomorphism which is homotopic to $f$. If $f$ is a special $TA$-map, then $A$ is a hyperbolic nil-endomorphism and $f$ is topologically conjugate to $A$.

A new combinatorial invariant caracterizing Anosov flows on 3-manifolds

In this paper, we describe a new approach to the problem of classification of transitive Anosov flows on 3-manifolds up to orbital equivalence. More specifically, generalizing the notion of Markov partition, we introduce the notion of Markovian family of rectangles in the bifoliated plane of an Anosov flow. We show that any transitive Anosov flow admits infinitely many Markovian families, each one of which can be canonically associated to a finite collection of combinatorial objects, called geometric types. We prove that any such geometric type describes completely the flow up to Dehn-Goodman-…

Anosov Lie algebras and algebraic units in number fields

We study nilmanifolds admitting Anosov automorphisms by applying elementary properties of algebraic units in number fields to the associated Anosov Lie algebras. We identify obstructions to the existence of Anosov Lie algebras. The case of 13-dimensional Anosov Lie algebras is worked out as an illustration of the technique. Also, we recapture the following known results: (i) Every 7-dimensional Anosov nilmanifold is toral, and (ii) every 8-dimensional Anosov Lie algebra with 3 or 5-dimensional derived algebra contains an abelian factor.

R-covered foliations and transverse pseudo-Anosov flows in atoroidal pieces

We study the transverse geometric behavior of 2-dimensional foliations in 3-manifolds. We show that an R-covered transversely orientable foliation with Gromov hyperbolic leaves in a closed 3-manifold admits a regulating, transverse pseudo-Anosov flow (in the appropriate sense) in each atoroidal piece of the manifold. The flow is a blow of a one prong pseudo-Anosov flow. In addition we show that there is a regulating flow for the whole foliation. We also determine how deck transformations act on the universal circle of the foliation.

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].

Topology of pre-images under Anosov endomorphisms

For an endomorphism it is known that if all the points in the manifold have dense sets of pre-images then the dynamical system is transitive. The inverse has been shown for a residual set of points but the the exact inverse has not yet been investigated before. Here we are going to show that under some conditions it is true for Anosov endomorphisms on closed manifolds, by using the fact that Anosov endomorphisms are covering maps.

Anosov automorphisms on nilmanifolds in dimensions 9 and 10

We study 9 and 10-dimensional Anosov Lie algebras, by using the properties of very special algebraic numbers. We classify k-step complex Anosov Lie algebras for $k>2$ and in the two step case, we give an example in each possible type, or we give a non-existence result.

A Note on Anosov flows of non-compact Riemannian manifolds

In this note we formulate a condition for complete, connected and non-compact Riemannian manifolds which implies no conjugate points in case that the geodesic flow is Anosov with respect to the Sasaki metric.

三维传递拓扑Anosov流的双曲模型

Hyperbolic models of transitive topologically Anosov flows in dimension three

本文证明了闭3-流形上的传递拓扑Anosov流轨道等价于保持遍历光滑体积形式的光滑Anosov流。

Anosov Automorphisms of Nilpotent Lie Algebras

Each matrix A in GL_n(Z) naturally defines an automorphism f of the free r-step nilpotent Lie algebra on n generators. We study the relationship between the matrix A and the eigenvalues and rational invariant subspaces for f. We give applications to the study of Anosov automorphisms.

从图流形上的伪Anosov流到完全周期性流

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。

二维环面上阿诺索夫微分同胚的稳定与不稳定流形的切空间

Tangent Space of the Stable And Unstable Manifold of Anosov Diffeomorphism on 2-Torus

本文针对二维环面上一类阿诺索夫微分同胚，利用形式级数与导数树方法，通过对坐标变换H重新标度，给出了稳定和不稳定流形切向量的显式公式。

Classification of regular and non-degenerate projectively Anosov flows on three dimensional manifolds

We give complete classification of C^2-regular and non-degenerate projectively Anosov flows on three dimensional manifolds. More precisely, we prove that such a flow on a connected manifold must be either an Anosov flow or represented as a finite union of $T^2 \times [0,1]$-models.

Regular projectively Anosov flows on three-dimensional manifolds

We give the complete classification of regular projectively Anosov flows on closed three-dimensional manifolds. More precisely, we show that such a flow must be either an Anosov flow or decomposed into a finite union of $T^2 \times I$-models. We also apply our method to rigidity problems of some group actions.

非R覆盖的超几何3流形中的Anosov流是准测地流

Non R-covered Anosov flows in hyperbolic 3-manifolds are quasigeodesic

研究证明非R覆盖的超几何三维流形中的Anosov流是准测地流，并展示了相关叶的连续延伸和群不变曲线的存在。

尖点3-流形上的阻碍Anosov流

Obstructing Anosov flows on cusped 3-manifolds

本文利用taut foliations与pseudo-Anosov flows的关系，找到了首批不支持veering triangulations的cusped hyperbolic 3-manifolds实例，证实了S. Schleimer的猜想。

Regular decay of ball diameters and spectra of Ruelle operators for contact Anosov flows

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 …

Nil-Anosov actions

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…

A dynamical Lefschetz trace formula for algebraic Anosov diffeomorphisms

For algebraic Anosov diffeomorphisms we first express the reduced leafwise cohomology with respect to the unstable foliation in terms of finite dimensional Lie algebra cohomology. We then prove a dynamical Lefschetz trace formula for the induced action on this cohomology using a result of Nomizu. We also consider generalized Anosov maps for which the cohomology in question is no longer finite dimensional in general. Using the representation theory of nilpotent Lie groups we still arrive at a meaningful definition of traces on cohomology. Again we establish a dynamical Lefschetz trace formula.

Smooth mixing Anosov flows in dimension three are exponential mixing

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.

Degenerate random perturbations of Anosov diffeomorphisms

This paper deals with random perturbations of diffeomorphisms on n-dimensional Riemannian manifolds with distributions supported on k-dimensional disks, where k<n. First we demonstrate general but not very intuitive conditions which guarantee that all invariant measures for rank k random perturbations of $C^2$ diffeomorphisms are absolutely continuous with respect to the Riemannian measure on M. For two subclasses of Anosov diffeomorphisms: hyperbolic toral automorphisms and Anosov diffeomorphisms with codimension 1 stable manifolds, the above conditions are modified in order to relate k-dimen…

Pseudo-Anosov flows in toroidal manifolds

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…

A new method for constructing Anosov Lie algebras

It is conjectured that every manifold admitting an Anosov diffeomorphism is, up to homeomorphism, finitely covered by a nilmanifold. Motivated by this conjecture, an important problem is to determine which nilmanifolds admit an Anosov diffeomorphism. The main theorem of this article gives a general method for constructing Anosov diffeomorphisms on nilmanifolds. As a consequence, we give counterexamples to a corollary of the classification of low-dimensional nilmanifolds with Anosov diffeomorphisms and a correction to this statement is proven. This method also answers some open questions about …

Equilibrium measures for certain isometric extensions of Anosov systems

We prove that for the frame flow on a negatively curved, closed manifold of odd dimension other than 7, and a Holder continuous potential that is constant on fibers, there is a unique equilibrium measure. We prove a similar result for automorphisms of the Heisenberg manifold fibering over the torus. Our methods also give an alternate proof of Brin and Gromov's result on the ergodicity of these frame flows.

在非紧流形上获得 Anosov 测地流的几何条件

Geometric conditions to obtain Anosov geodesic flow in non-compact manifolds

本文研究完备非紧无焦点流形上测地流成为 Anosov 型的几何判据，证明沿测地线的切平面截面曲率平均一致为负即可保证该性质，并据此构造非正曲率非紧例子。

Anosov diffeomorphisms on infra-nilmanifolds associated to graphs

Anosov diffeomorphisms on closed Riemannian manifolds are a type of dynamical systems exhibiting uniform hyperbolic behavior. Therefore their properties are intensively studied, including which spaces allow such a diffeomorphism. It is conjectured that any closed manifold admitting an Anosov diffeomorphism is homeomorphic to an infra-nilmanifold, i.e. a compact quotient of a 1-connected nilpotent Lie group by a discrete group of isometries. This conjecture motivates the problem of describing which infra-nilmanifolds admit an Anosov diffeomorphism. So far, most research was focused on the restr…

Classifying expanding attractors on figure eight knot complement space and non-transitive Anosov flows on Franks-Williams manifold

The path closure of figure eight knot complement space, $N_0$, supports a natural DA (derived from Anosov) expanding attractor. Using this attractor, Franks-Williams constructed the first example of non-transitive Anosov flow on the manifold $M_0$ obtained by gluing two copies of $N_0$ through identity map along their boundaries, named by Franks-Williams manifold. In this paper, our main goal is to classify expanding attractors on $N_0$ and non-transitive Anosov flows on $M_0$. We prove that, up to orbit-equivalence, the DA expanding attractor is the unique expanding attractor supported by $N_…

三维空间中接触Anosov流的有效等分布理论

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。

An expansive homeomorphism of a 3-manifold with a local stable set that is not locally connected

In this article we construct an expansive homeomorphism of a compact three-dimensional manifold with a fixed point whose local stable set is not locally connected. This homeomorphism is obtained as a topological perturbation of a quasi-Anosov diffeomorphism that is not Anosov.

Contributions to the study of Anosov Geodesic Flows in Non-Compact Manifolds

In this paper we prove that if the geodesic flow of a {compact or non-compact} complete manifold without conjugate points is of the Anosov type, then the average of the integral of the sectional curvature along the geodesic is negative and away from zero from a uniform time. Moreover, in dimension two, if the manifold has no focal points, then this condition is sufficient to obtain that the geodesic flow is of Anosov type. This sufficient condition will also be used to construct new examples of non-compact surfaces whose geodesic flow is of the Anosov type.

余维一的外斯阿诺夫流

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。

Foliations and Conjugacy:Anosov Structures in the plane

In a non-compact setting, the notion of hyperbolicity, and the associated structure of stable and unstable manifolds (for unbounded orbits), is highly dependent on the choice of metric used to define it. We consider the simplest version of this, the analogue for the plane of Anosov diffeomorphisms, studied earlier by W. White and P. Mendes. The two known topological conjugacy classes of such diffeomorphisms are linear hyperbolic automorphisms and translations. We show that if the structure of stable and unstable manifolds is required to be preserved by these conjugacies, the number of distinct…

Sectional Anosov flows: Existence of Venice masks with two singularities

We show the existence of Venice masks (i.e. nontransitive sectional Anosov flows with dense periodic orbits), containing two equilibria on certain compact 3-manifolds. Indeed, the only known examples of venice masks have one or three singularities, and they are characterized by having two properties: are the union non disjoint of two homoclinic classes and whose intersection is the closure of the unstable manifold of a singularity. Thus, we present two type of examples containing two equilibria in which the homoclinic classes composing their maximal invariant set intersect in a very different …

Stochastic stability of sectional-Anosov flows

A {\em sectional-Anosov flow} is a vector field on a compact manifold inwardly transverse to the boundary such that the maximal invariant set is sectional-hyperbolic (in the sense of \cite{mm}). We prove that any $C^2$ transitive sectional-Anosov flow has a unique SRB measure which is stochastically stable under small random perturbations.