Stephane Le Borgne
We give examples of quasi-hyperbolic dynamical systems with the following properties : polynomial decay of correlations, convergence in law toward a non gaussian law of the ergodic sums (divided by $n^{3/4}$) associated to non degenerated regular functions.
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Statistical properties for irregular observables in slowly mixing hyperbolic systems
本文针对多项式混合双曲动力系统的非光滑可观测量，证明了相关性衰减等多种统计性质，填补了慢混合双曲系统相关结果的空白，对多学科应用具有重要意义。
The hyperbolic umbilic singularity in fast-slow systems
本文针对含三个慢变量、快变量具梯度结构的快慢系统，采用爆破技术将双曲脐点爆破为5维球面，分析其附近局部动力学，证明非退化条件下吸引慢流形过奇点时跃迁快区并扇形展开，同时关联了突变理论等经典结果。
We consider complex Henon maps which are quasi-hyperbolic. We show that a quasi-hyperbolic map is uniformly hyperbolic if and only if there are no tangencies between stable and unstable manifolds.
We provide a systematic approach for deducing statistical limit laws via martingale-coboundary decomposition, for nonuniformly hyperbolic systems with slowly contracting and expanding directions. In particular, if the associated return time function is square-integrable, then we obtain the central limit theorem, the weak invariance principle, and an iterated version of the weak invariance principle.
We consider a simple class of fast-slow partially hyperbolic dynamical systems and show that the (properly rescaled) behaviour of the slow variable is very close to a Friedlin--Wentzell type random system for times that are rather long, but much shorter than the metastability scale. Also, we show the possibility of a "sink" with all the Lyapunov exponents positive, a phenomenon that turns out to be related to the lack of absolutely continuity of the central foliation.
Bi-shadowing of Quasi-semi-hyperbolic Pseudo-orbit
本文引入准半超双曲伪轨道的概念，证明在误差足够小时，准半超双曲性蕴含准双曲性，并展示了有限和无限的准双曲伪轨道均具有双影子性质，从而确立了周期性。
We prove several limit theorems for a simple class of partially hyperbolic fast-slow systems. We start with some well know results on averaging, then we give a substantial refinement of known large (and moderate) deviation results and conclude with a completely new result (a local limit theorem) on the distribution of the process determined by the fluctuations around the average. The method of proof is based on a mixture of standard pairs and Transfer Operators that we expect to be applicable in a much wider generality.
Consider a nonuniformly hyperbolic map $ T $ modelled by a Young tower with tails of the form $ O(n^{-β}) $, $ β>2 $. We prove optimal moment bounds for Birkhoff sums $ \sum_{i=0}^{n-1}v\circ T^i $ and iterated sums $ \sum_{0\le i<j<n}v\circ T^i\, w\circ T^j $, where $ v,w:M\to \Bbb{R}$ are (dynamically) Hölder observables. Previously iterated moment bounds were only known for $ β>5$. Our method of proof is as follows; (i) prove that $ T $ satisfies an abstract functional correlation bound, (ii) use a weak dependence argument to show that the functional correlation bound implies moment estimat…
We consider a class of $\mathcal C^{4}$ partially hyperbolic systems on $\mathbb T^2$ described by maps $F_\varepsilon(x,θ)=(f(x,θ),θ+\varepsilonω(x,θ))$ where $f(\cdot,θ)$ are expanding maps of the circle. For sufficiently small $\varepsilon$ and $ω$ generic in an open set, we precisely classify the SRB measures for $F_\varepsilon$ and their statistical properties, including exponential decay of correlation for Hölder observables with explicit and nearly optimal bounds on the decay rate.
We give explicit examples of pairs of Julia sets of hyperbolic rational maps which are homeomorphic but not quasisymmetrically homeomorphic.
In this paper we study the stabilization problem of a general class of slow-fast systems with one fast and arbitrarily many slow states. Moreover, the class of systems under study is slowly actuated, meaning that only the slow states are subject to the action of a controller. Furthermore, we are particularly interested in the case where normal hyperbolicity is lost. We show that by using the Geometric Desingularization method, it is possible to design controllers to locally stabilize non-hyperbolic points of any finite degeneracy. The main novelty of this paper is that, unlike previous researc…
Quasi-shadowing property for nonuniformly partially hyperbolic systems
本文研究非一致部分双曲系统，建立自适应伪轨道运动的拟跟踪性质，并考察拟 specification 与拟闭合性质，进而将 Katok 周期轨道增长结果推广到任意遍历测度。
A partially hyperbolic diffeomorphism $f$ is structurally quasi-stable if for any diffeomorphism $g$ $C^1$-close to $f$, there is a homeomorphism $π$ of $M$ such that $π\circ g$ and $f\circπ$ differ only by a motion $τ$ along center directions. $f$ is topologically quasi-stable if for any homeomorphism $g$ $C^0$-close to $f$, the above holds for a continuous map $π$ instead of a homeomorphism. We show that any partially hyperbolic diffeomorphism $f$ is topologically quasi-stable, and if $f$ has $C^1$ center foliation $W^c_f$, then $f$ is structurally quasi-stable. As applications we obtain con…
A partially hyperbolic diffeomorphism $f$ has quasi-shadowing property if for any pseudo orbit ${x_k}_{k\in \mathbb{Z}}$, there is a sequence of points ${y_k}_{k\in \mathbb{Z}}$ tracing it in which $y_{k+1}$ is obtained from $f(y_k)$ by a motion $τ$ along the center direction. We show that any partially hyperbolic diffeomorphism has quasi-shadowing property, and if $f$ has $C^1$ center foliation then we can require $τ$ to move the points along the center foliation. As applications, we show that any partially hyperbolic diffeomorphism is topologically quasi-stable under $C^0$-perturbation. When…
Extending Discrete Geometric Singular Perturbation Theory to Non-Hyperbolic Points
本文利用Takens嵌入定理将离散几何奇异摄动理论扩展到非正规双曲区域，证明快慢映射在非双曲奇点附近的动力学可由相应快慢向量场的时间1映射局部逼近，并应用于折叠、跨临界、叉形等奇点及中心流形分析。
Let $f$ be a partially hyperbolic diffeomorphism. $f$ is called has the quasi-shadowing property if for any pseudo orbit $\{x_k\}_{k\in \mathbb{Z}}$, there is a sequence $\{y_k\}_{k\in \mathbb{Z}}$ tracing it in which $y_{k+1}$ lies in the local center leaf of $f(y_k)$ for any $k\in \mathbb{Z}$. $f$ is called topologically quasi-stable if for any homeomorphism $g$ $C^0$-close to $f$, there exist a continuous map $π$ and a motion $τ$ along the center foliation such that $π\circ g=τ\circ f\circπ$. In this paper we prove that if $f$ is dynamically coherent then it has quasi-shadowing and topologi…
Statistical properties of mostly expanding fast-slow partially hyperbolic systems
针对环面$\mathbb{T}^2$上由圆扩张映射$ε$扰动得到的快慢$C^4$部分双曲系统，证明了足够小$ε$和开集扰动下物理测度的存在唯一性及光滑可观测量相关性指数衰减，补充了De Simoi和Liverani关于大部分收缩中心的研究。
The classification, by topological conjugacy, of invertible holomorphic germs $f:(\mathbb{C}^n,0)\to (\mathbb{C}^n,0)$, with $λ_1,...,λ_n$ eigenvalues of $df_0$, and $|λ_i|\neq 1$ for $i=2,...,n$ while $λ_1$ is a root of the unity, is given, in the suitable hypothesis of ``quasi-absence'' of resonances.
It is shown that for non-hyperbolic real quadratic polynomials topological and quasisymmetric conjugacy classes are the same. By quasiconformal rigidity, each class has only one representative in the quadratic family, which proves that hyperbolic maps are dense.
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。
This paper continues our investigation of the dynamics of polynomial diffeomorphisms of C^2. We introduce a dynamical property of polynomial diffeomorphisms that generalizes hyperbolicity in the way that semi-hyperbolicity generalizes hyperbolicity for polynomial maps of the complex plane.
We show that a strong partially hyperbolic diffeomorphism of $\mathbb{T}^3$ isotopic to Anosov has a unique quasi-attractor. Moreover, we study the entropy of the diffeomorphism restricted to this quasi-attractor.
Computer assisted proofs for hyperbolic quasi-periodic invariant tori in dissipative twist maps
本文提出并实现了一种基于后验KAM型定理的计算机辅助方法，用于证明耗散标准映射中双曲准周期不变环面的存在性，并为特定参数提供了不变圆的严格证明。
Partially Hyperbolic Dynamics with Quasi-isometric Center
本文研究了闭3-流形上具有拟等距中心的偏双曲微分同胚，证明了在无su-环面时的可达性与遍历性，确认了Hertz-Hertz-Ures遍历性猜想，并给出了此类微分同胚的完整分类。
It is known that every infinite index quasi-convex subgroup $H$ of a non-elementary hyperbolic group $G$ is a free factor in a larger quasi-convex subgroup of $G$. We give a probabilistic generalization of this result. That is, we show that when $R$ is a subgroup generated by independent random walks in $G$, then $\langle H, R\rangle\cong H\ast R$ with probability going to one as the lengths of the random walks go to infinity and this subgroup is quasi-convex in $G$. Moreover, our results hold for a large class of groups acting on hyperbolic metric spaces and subgroups with quasi-convex orbits…
The mapping class group $Γ$ of the complement of a Cantor set in the plane arises naturally in dynamics. We show that the ray graph, which is the analog of the complex of curves for this surface of infinite type, has infinite diameter and is hyperbolic. We use the action of $Γ$ on this graph to find an explicit non trivial quasimorphism on $Γ$ and to show that this group has infinite dimensional second bounded cohomology. Finally we give an example of a hyperbolic element of $Γ$ with vanishing stable commutator length. This carries out a program proposed by Danny Calegari.
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