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Documents  37D25 | enregistrements trouvés : 34

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- xv; 340 p.
ISBN 978-0-8218-4286-7

Contemporary mathematics , 0469

Localisation : Collection 1er étage

système dynamique # méthode probabiliste # géométrie riemannienne # biologie # dynamique symbolique # dynamique stochastique # dynamique aléatoire

37D20 ; 37D25 ; 37D40 ; 37D45 ; 37E05 ; 37H10 ; 37C85 ; 60G07 ; 70H05 ; 37-06 ; 00B25 ; 34-06

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Research schools;Dynamical Systems and Ordinary Differential Equations;Geometry

We study dynamics of geodesic flows over closed surfaces of genus greater than or equal to 2 without focal points. Especially, we prove that there is a large class of potentials having unique equilibrium states, including scalar multiples of the geometric potential, provided the scalar is less than 1. Moreover, we discuss ergodic properties of these unique equilibrium states. We show these unique equilibrium states are Bernoulli, and weighted regular periodic orbits are equidistributed relative to these unique equilibrium states. We study dynamics of geodesic flows over closed surfaces of genus greater than or equal to 2 without focal points. Especially, we prove that there is a large class of potentials having unique equilibrium states, including scalar multiples of the geometric potential, provided the scalar is less than 1. Moreover, we discuss ergodic properties of these unique equilibrium states. We show these unique equilibrium states are Bernoulli, and weighted ...

37D35 ; 37D40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations

Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away from zero for $\delta \in]0,htop(f)[$ are equidistributed along measures of maximal entropy. - for C∞ maps the entropy is physically greater than or equal to the top Lyapunov exponents of the exterior powers. Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away ...

37C05 ; 37C40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations

Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away from zero for $\delta \in]0,htop(f)[$ are equidistributed along measures of maximal entropy. - for C∞ maps the entropy is physically greater than or equal to the top Lyapunov exponents of the exterior powers. Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away ...

37C05 ; 37C40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations

Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away from zero for $\delta \in]0,htop(f)[$ are equidistributed along measures of maximal entropy. - for C∞ maps the entropy is physically greater than or equal to the top Lyapunov exponents of the exterior powers. Smooth parametrizations of semi-algebraic sets were introduced by Yomdin in order to bound the local volume growth in his proof of Shub’s entropy conjecture for C∞ maps. In this minicourse we will present some refinement of Yomdin’s theory which allows us to also control the distortion. We will give two new applications: - for any C∞ surface diffeomorphism f with positive entropy the saddle periodic points with Lyapunov exponents $\delta$-away ...

37C05 ; 37C40 ; 37D25

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Research talks;Dynamical Systems and Ordinary Differential Equations;Algebraic and Complex Geometry;Topology

We give a necessary and sufficient condition for the existence of infinitely many non-arithmetic Teichmuller curves in a stratum of abelian differentials. This is joint work with Simion Filip and Alex Wright.

30F30 ; 32G15 ; 32G20 ; 14D07 ; 37D25

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Research talks;Dynamical Systems and Ordinary Differential Equations

We obtain results on mixing and rates of mixing for infinite measure semiflows and flows. The results on rates of mixing rely on operator renewal theory and a Dolgopyat-type estimate. The results on mixing hold more generally and are based on a deterministic (ie non iid) version of Erickson's continuous time strong renewal theorem.

37A25 ; 37A40 ; 37A50 ; 37D25

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Research talks;Dynamical Systems and Ordinary Differential Equations;Probability and Statistics

​An almost Anosov flow is a flow having continuous flow-invariant splitting of the tangent bundle with exponential expansion/contraction in the unstable/stable direction, except for a finite number (in our case a single) periodic orbits. Roughly, almost Anosov flows are perturbed Anosov flows, where the perturbation is local around these periodic orbits, making them neutral. For this type of flows, we obtain limit theorems (stable, standard and non-standard CLT) for a large class of (unbounded) observables. I will present these results stressing on the method of proof. This is joint work with H. Bruin and M. Todd. ​An almost Anosov flow is a flow having continuous flow-invariant splitting of the tangent bundle with exponential expansion/contraction in the unstable/stable direction, except for a finite number (in our case a single) periodic orbits. Roughly, almost Anosov flows are perturbed Anosov flows, where the perturbation is local around these periodic orbits, making them neutral. For this type of flows, we obtain limit theorems (stable, standard and ...

37D35 ; 60J10 ; 37D25 ; 37A10 ; 37E05

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Research talks;Dynamical Systems and Ordinary Differential Equations;Probability and Statistics

​We investigate the diffusion and statistical properties of Lorentz gas with cusps at flat points. This is a modification of dispersing billiards with cusps. The decay rates are proven to depend on the degree of the flat points, which varies from $n^{-a}$, for $ a\in (0,\infty)$. The stochastic processes driven by these systems enjoy stable law and have super-diffusion driven by Lévy process. This is a joint work with Paul Jung and Françoise Pène. ​We investigate the diffusion and statistical properties of Lorentz gas with cusps at flat points. This is a modification of dispersing billiards with cusps. The decay rates are proven to depend on the degree of the flat points, which varies from $n^{-a}$, for $ a\in (0,\infty)$. The stochastic processes driven by these systems enjoy stable law and have super-diffusion driven by Lévy process. This is a joint work with Paul Jung and Françoise ...

37D50 ; 37A25 ; 60F05 ; 37D25

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Research talks;Dynamical Systems and Ordinary Differential Equations;Probability and Statistics

It has long been observed that multi-scale systems, particularly those in climatology, exhibit behavior typical of stochastic models, most notably in the unpredictability and statistical variability of events. This is often in spite of the fact that the underlying physical model is completely deterministic. One possible explanation for this stochastic behavior is deterministic chaotic effects. In fact, it has been well established that the statistical properties of chaotic systems can be well approximated by stochastic differential equations. In this talk, we focus on fast-slow ODEs, where the fast, chaotic variables are fed into the slow variables to yield a diffusion approximation. In particular we focus on the case where the chaotic noise is multidimensional and multiplicative. The tools from rough path theory prove useful in this difficult setting. It has long been observed that multi-scale systems, particularly those in climatology, exhibit behavior typical of stochastic models, most notably in the unpredictability and statistical variability of events. This is often in spite of the fact that the underlying physical model is completely deterministic. One possible explanation for this stochastic behavior is deterministic chaotic effects. In fact, it has been well established that the ...

60H10 ; 37D20 ; 37D25 ; 37A50

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Research schools;Dynamical Systems and Ordinary Differential Equations

These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, the question of when the “pressure gap” hypothesis can be verified becomes crucial. I will sketch our proof of the “entropy gap”, which is a new direct constructive proof of a result by Knieper. I will also describe new joint work with Ben Call, which shows that all the unique equilibrium states provided above have the Kolmogorov property. When the manifold has dimension at least 3, this is a new result even for the Knieper-Bowen-Margulis measure of maximal entropy. The common thread that links all of these arguments is that they rely on weak orbit specification properties in the spirit of Bowen. These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, ...

37D35 ; 37D40 ; 37C40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations

These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, the question of when the “pressure gap” hypothesis can be verified becomes crucial. I will sketch our proof of the “entropy gap”, which is a new direct constructive proof of a result by Knieper. I will also describe new joint work with Ben Call, which shows that all the unique equilibrium states provided above have the Kolmogorov property. When the manifold has dimension at least 3, this is a new result even for the Knieper-Bowen-Margulis measure of maximal entropy. The common thread that links all of these arguments is that they rely on weak orbit specification properties in the spirit of Bowen. These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, ...

37D35 ; 37D40 ; 37C40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations

These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, the question of when the “pressure gap” hypothesis can be verified becomes crucial. I will sketch our proof of the “entropy gap”, which is a new direct constructive proof of a result by Knieper. I will also describe new joint work with Ben Call, which shows that all the unique equilibrium states provided above have the Kolmogorov property. When the manifold has dimension at least 3, this is a new result even for the Knieper-Bowen-Margulis measure of maximal entropy. The common thread that links all of these arguments is that they rely on weak orbit specification properties in the spirit of Bowen. These lectures are a mostly self-contained sequel to Vaughn Climenhaga’s talks in week 1. The focus of the week 2 lectures will be on uniqueness of equilibrium states for rank 1 geodesic flows, and their mixing properties. Burns, Climenhaga, Fisher and myself showed recently that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. I will discuss the proof of this result. With this result in hand, ...

37D35 ; 37D40 ; 37C40 ; 37D25

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Research schools;Dynamical Systems and Ordinary Differential Equations;Probability and Statistics

$Let (X,T)$ be a dynamical system preserving a probability measure $\mu $. A concentration inequality quantifies how small is the probability for $F(x,Tx,\ldots,T^{n-1}x)$ to deviate from $\int F(x,Tx,\ldots,T^{n-1}x) \mathrm{d}\mu(x)$ by an given amount $u$, where $F:X^n\to\mathbb{R}$ is supposed to be separately Lipschitz. The bound on that probability involves a constant $C$ depending only on the dynamical system (thus independent of $n$), and $\sum_{i=0}^{n-1} \mathrm{Lip}_i(F)^2$. In the best situation, the bound is $\exp(-C u^2/\sum_{i=0}^{n-1} \mathrm{Lip}_i(F)^2)$.
After explaining how to get such a bound for independent random variables, I will show how to prove it for a Gibbs measure on a shift of finite type with a Lipschitz potential, and present examples of functions $F$ to which one can apply the inequality. Finally, I will survey some results obtained for nonuniformly hyperbolic systems modeled by Young towers.
$Let (X,T)$ be a dynamical system preserving a probability measure $\mu $. A concentration inequality quantifies how small is the probability for $F(x,Tx,\ldots,T^{n-1}x)$ to deviate from $\int F(x,Tx,\ldots,T^{n-1}x) \mathrm{d}\mu(x)$ by an given amount $u$, where $F:X^n\to\mathbb{R}$ is supposed to be separately Lipschitz. The bound on that probability involves a constant $C$ depending only on the dynamical system (thus independent of $n$), ...

37D20 ; 37D25 ; 37A50

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- xii; 297 p.
ISBN 978-3-0348-0205-5

Progress in mathematics , 0294

Localisation : Collection 1er étage

système dynamique # analyse multifractale # formalisme thermodynamique

37D35 ; 37D20 ; 37D25 ; 37C45 ; 37-02 ; 37N20

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- 281 p.
ISBN 978-0-521-86813-6

Cambridge monographs on applied and computational mathematics , 0022

Localisation : Ouvrage RdC (STUR)

application dérivant de la verticlae # système dynamique # mélange # hiérarchie ergodique # ergodicité # propriété de Bernouilli # exposant de Lyapunov # hyperbolicité # torus # fer cheval # biologie

37E40 ; 37-02 ; 37A25 ; 37N10 ; 37N25 ; 37B05 ; 37B10 ; 37B25 ; 37D20 ; 37D25 ; 76-02

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- vii; 177 p.
ISBN 978-2-85629-904-3

Astérisque , 0410

Localisation : Périodique 1er étage

hyperbolicté non-uniforme # sélection de paramètres # application unimodale # attracteur Hénon # dynamiques chaotiques # dynamiques en petite dimension # pièce de puzzle

37D20 ; 37D25 ; 37D45 ; 37C40 ; 37E30

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- xvii; 340 p.
ISBN 978-2-85629-917-3

Astérisque , 0416

Localisation : Périodique 1er étage

accessibilité # application Gevrey # $(C^{0})$-commutativité au sens de Poisson # centralisateurs # changements de temps # complète integrabilité # conditions diophantiennes # coordonnées de Fatou # décroissance des corrélations # déviations des moyennes ergodiques # difféomorphismes analytiques du cercle # dimension centrale # distribution limites # domaine de rotation # dynamique holomorphe # échanges d'intervalle # feuilletage invariant # feuilletages # flots nilpotents de Heisenberg # fonctions génératrices # germes holomorphes de $\mathbb{C}^{2}$ # hamiltoniens # hérissons # homéomorphismes symplectiques # hyperbolicité faible # hyperbolicité partielle # instabilité # linéarisation # mélange # nombre de rotation # pétales invariants # petits diviseurs # point fixe elliptique # points fixes indifférents # renormalisation # renormalisation sectorielle # sommes de Birkhoff # sous-variétés lagrangiennes # symplectomorphisme # système dynamique # théorème de translation plane de Brouwer # théorèmes d’Arnold- Liouville # type Roth # variété centrale # vitesses de mélange accessibilité # application Gevrey # $(C^{0})$-commutativité au sens de Poisson # centralisateurs # changements de temps # complète integrabilité # conditions diophantiennes # coordonnées de Fatou # décroissance des corrélations # déviations des moyennes ergodiques # difféomorphismes analytiques du cercle # dimension centrale # distribution limites # domaine de rotation # dynamique holomorphe # échanges d'intervalle # feuilletage invariant # ...

32A10 ; 37A17 ; 37A25 ; 37A50 ; 37C40 ; 37C75 ; 37D30 ; 37E05 ; 37E30 ; 37F25 ; 37F50 ; 37J50 ; 53D12 ; 60F05 ; 70H20 ; 37D25

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- xxvii; 274 p.
ISBN 978-2-85629-916-6

Astérisque , 0415

Localisation : Périodique 1er étage

actions de groupes paraboliques # automorphismes polynomiaux de $\mathbb{C}^{2}$ # Birkhoff # cocycles projectivisés # combinatoire # compacité # courbe analytique réelle # courbes férales # courbes pseudoholomorphiques # décomposition de Thurston-Nielsen # diagramme de cordes # diagramme de Rauzy # diagramme de séparatrices # dimensions # distribution de Cauchy # distribution uniforme # éclatement # ensembles de Cantor réguliers # espaces des modules des différentielles abéliennes # exposants de Lyapunov # graphe distance héréditaire # groupe nilpotent # lemme de fermeture ergodique # mécanique des fluides numérique # mesures invariantes # nombre d'enlacement # nombre de rotation # opérade # Poincaré # point fixe # quasi-périodicité # récurrence par chaînes # revêtement infini cyclique # rotations du cercle # singularité # spectres dynamiques de Markov et Lagrange # surface à petits carreaux # systèmes dynamiques # théorèmes limites "annealed" # théorèmes limites pour les moyennes temporelles # volume de Masur-Veech actions de groupes paraboliques # automorphismes polynomiaux de $\mathbb{C}^{2}$ # Birkhoff # cocycles projectivisés # combinatoire # compacité # courbe analytique réelle # courbes férales # courbes pseudoholomorphiques # décomposition de Thurston-Nielsen # diagramme de cordes # diagramme de Rauzy # diagramme de séparatrices # dimensions # distribution de Cauchy # distribution uniforme # éclatement # ensembles de Cantor réguliers # espaces des ...

05A05 ; 05A16 ; 11J06 ; 20C30 ; 28A78 ; 30F30 ; 30F60 ; 32Q65 ; 34D08 ; 37Bxx ; 37B20 ; 37C40 ; 37C60 ; 37C85 ; 37D20 ; 37D25 ; 37E30 ; 37F10 ; 37F15 ; 37F45 ; 57S25 ; 58F08 ; 76A99 ; 37C55 ; 37D35 ; 53D42

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- x; 497 p.
ISBN 978-2-85629-836-7

Astérisque , 0380

Localisation : Périodique 1er étage

combinatoire # théorie des catégories # théorie des topos supérieurs # théorie de la mesure géométrique # équation aux dérivées partielles # théorie spectrale # géométrie différentielle # théorie ergodique # théorie géométrique des groupes # géométrie algébrique # représentation galoisienne # point rationnel

20F65 ; 20F67 ; 20F06 ; 57M50 ; 20F28 ; 14E07 ; 18A25 ; 06A07 ; 16P40 ; 18A40 ; 18E15 ; 20J06 ; 55S10 ; 35Q31 ; 37C40 ; 37D25 ; 37D40 ; 49Q15 ; 49Q20 ; 49N60 ; 35B50 ; 35P15 ; 53C44 ; 53A10 ; 53C55 ; 53C25 ; 14J45 ; 32Q20 ; 32W20 ; 11G35 ; 14G25 ; 18-02 ; 18B25 ; 18E35 ; 18G30 ; 18G55 ; 55U40 ; 53D25 ; 37C30 ; 37D20 ; 46B20 ; 46A32 ; 46B28 ; 47A15 ; 05B05 ; 05D40 ; 05C70 ; 51E05 ; 05B40 ; 14E05 ; 14L30 ; 19E08 ; 13A18 ; 11F75 ; 11G18 ; 14L05 ; 14G35 ; 14G22 ; 20H10 ; 30F60 ; 32G15 ; 53C50

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