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Search Results: 1 - 10 of 193559 matches for " Frédéric Faure "
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Semiclassical origin of the spectral gap for transfer operators of partially expanding map
Frédéric Faure
Mathematics , 2009,
Abstract: We consider a simple model of partially expanding map on the torus. We study the spectrum of the Ruelle transfer operator and show that in the limit of high frequencies in the neutral direction (this is a semiclassical limit), the spectrum develops a spectral gap, for a generic map. This result has already been obtained by M. Tsujii (05). The novelty here is that we use semiclassical analysis which provides a different and quite natural description. We show that the transfer operator is a semiclassical operator with a well defined "classical dynamics" on the cotangent space. This classical dynamics has a "trapped set" which is responsible for the Ruelle resonances spectrum. In particular we show that the spectral gap is closely related to a specific dynamical property of this trapped set.
Band structure of the Ruelle spectrum of contact Anosov flows
Frédéric Faure,Masato Tsujii
Mathematics , 2013,
Abstract: If X is a contact Anosov vector field on a smooth compact manifold M and V is a smooth function on M, it is known that the differential operator A=-X+V has some discrete spectrum called Ruelle-Pollicott resonances in specific Sobolev spaces. We show that for |Im(z)| large the eigenvalues of A are restricted to vertical bands and in the gaps between the bands, the resolvent of A is bounded uniformly with respect to |Im(z)|. In each isolated band the density of eigenvalues is given by the Weyl law. In the first band, most of the eigenvalues concentrate of the vertical line Re(z)=< D >, the space average of the function D(x)=V(x)-1/2 div(X)/E_u where Eu is the unstable distribution. This band spectrum gives an asymptotic expansion for dynamical correlation functions.
The semiclassical zeta function for geodesic flows on negatively curved manifolds
Frédéric Faure,Masato Tsujii
Mathematics , 2013,
Abstract: We consider the semi-classical (or Gutzwiller-Voros) zeta function for $C^\infty$ contact Anosov flows. Analyzing the spectrum of transfer operators associated to the flow, we prove, for any $\tau>0$, that its zeros are contained in the union of the $\tau$-neighborhood of the imaginary axis, $|\Re(s)|<\tau$, and the region $\Re(s)<-\chi_0+\tau$, up to finitely many exceptions, where $\chi_0>0$ is the hyperbolicity exponent of the flow. Further we show that the zeros in the neighborhood of the imaginary axis satisfy an analogue of the Weyl law.
Upper bound on the density of Ruelle resonances for Anosov flows
Frédéric Faure,Johannes Sjoestrand
Mathematics , 2010, DOI: 10.1007/s00220-011-1349-z
Abstract: Using a semiclassical approach we show that the spectrum of a smooth Anosov vector field V on a compact manifold is discrete (in suitable anisotropic Sobolev spaces) and then we provide an upper bound for the density of eigenvalues of the operator (-i)V, called Ruelle resonances, close to the real axis and for large real parts.
Asymptotic spectral gap for open partially expanding maps
Frédéric Faure,Tobias Weich
Mathematics , 2015,
Abstract: We consider a simple model of an open partially expanding map. Its trapped set is a fractal set. We are interested by the quantity $\gamma_{asympt.}:=\limsup_{\hbar\rightarrow0}\log\left(r_{s}\left(\mathcal{L}_{\hbar}\right)\right)$, namely the log of the spectral radius of the transfer operator $\mathcal{L}_{\hbar}$ in the limit of high frequencies $1/\hbar$ in the neutral direction. Under some hypothesis it is known from D. Dolgopyat 2002 that $\exists\epsilon>0, \gamma_{asympt.}\leq\gamma_{Gibbs}-\epsilon$ with $\gamma_{Gibbs}=\mathrm{Pr}\left(V-J\right)$ and using semiclassical analysis that $\gamma_{asympt.}\leq\gamma_{sc}=\mathrm{sup}\left(V-\frac{1}{2}J\right)$, where $\mathrm{Pr}\left(.\right)$ is the topological pressure, $J>0$ is the expansion rate function and $V$ is the potential function which enter in the definition of the transfer operator. In this paper we show $\gamma_{asympt}\leq\gamma_{up}:=\frac{1}{2}\mathrm{Pr}\left(2\left(V-J\right)\right)+\frac{1}{4}\left\langle J\right\rangle $ where $\left\langle J\right\rangle$ is an averaged expansion rate given in the text. To get these results, we introduce some new techniques such as a global normal form for the dynamical system, a semiclassical expression beyond the Ehrenfest time that expresses the transfer operator at large time as a sum over rank one operators (each is associated to one orbit) and establish the validity of the so-called diagonal approximation up to twice the local Ehrenfest time. Finally, with an heuristic random phases approximation we get the conjecture that generically $\gamma_{asympt}=\gamma_{conj}:=\frac{1}{2}\mathrm{Pr}\left(2\left(V-J\right)\right)$.
Prequantum transfer operator for symplectic Anosov diffeomorphism
Frédéric Faure,Masato Tsujii
Mathematics , 2012,
Abstract: We define the prequantization of a symplectic Anosov diffeomorphism f:M-> M, which is a U(1) extension of the diffeomorphism f preserving an associated specific connection, and study the spectral properties of the associated transfer operator, called prequantum transfer operator. This is a model for the transfer operators associated to geodesic flows on negatively curved manifolds (or contact Anosov flows). We restrict the prequantum transfer operator to the N-th Fourier mode with respect to the U(1) action and investigate the spectral property in the limit N->infinity, regarding the transfer operator as a Fourier integral operator and using semi-classical analysis. In the main result, we show a " band structure " of the spectrum, that is, the spectrum is contained in a few separated annuli and a disk concentric at the origin. We show that, with the special (H\"older continuous) potential V0=1/2 log |det Df_x|_{E_u}|, the outermost annulus is the unit circle and separated from the other parts. For this, we use an extension of the transfer operator to the Grassmanian bundle. Using Atiyah-Bott trace formula, we establish the Gutzwiller trace formula with exponentially small reminder for large time. We show also that, for a potential V such that the outermost annulus is separated from the other parts, most of the eigenvalues in the outermost annulus concentrate on a circle of radius exp where <.> denotes the spatial average on M. The number of these eigenvalues is given by the "Weyl law", that is, N^d.Vol(M) with d=1/2. dim(M) in the leading order. We develop a semiclassical calculus associated to the prequantum operator by defining quantization of observables Op(psi) in an intrinsic way. We obtain that the semiclassical Egorov formula of quantum transport is exact. We interpret all these results from a physical point of view as the emergence of quantum dynamics in the classical correlation functions for large time. We compare these results with standard quantization (geometric quantization) in quantum chaos.
Resonance chains in open systems, generalized zeta functions and clustering of the length spectrum
Sonja Barkhofen,Frédéric Faure,Tobias Weich
Mathematics , 2014, DOI: 10.1088/0951-7715/27/8/1829
Abstract: In many non-integrable open systems in physics and mathematics resonances have been found to be surprisingly ordered along curved lines in the complex plane. In this article we provide a unifying approach to these resonance chains by generalizing dynamical zeta functions. By means of a detailed numerical study we show that these generalized zeta functions explain the mechanism that creates the chains of quantum resonance and classical Ruelle resonances for 3-disk systems as well as geometric resonances on Schottky surfaces. We also present a direct system-intrinsic definition of the continuous lines on which the resonances are strung together as a projection of an analytic variety. Additionally, this approach shows that the existence of resonance chains is directly related to a clustering of the classical length spectrum on multiples of a base length. Finally, this link is used to construct new examples where several different structures of resonance chains coexist.
Power spectrum of the geodesic flow on hyperbolic manifolds
Semyon Dyatlov,Frédéric Faure,Colin Guillarmou
Mathematics , 2014, DOI: 10.2140/apde.2015.8.923
Abstract: We describe the complex poles of the power spectrum of correlations for the geodesic flow on compact hyperbolic manifolds in terms of eigenvalues of the Laplacian acting on certain natural tensor bundles. These poles are a special case of Pollicott-Ruelle resonances, which can be defined for general Anosov flows. In our case, resonances are stratified into bands by decay rates. The proof also gives an explicit relation between resonant states and eigenstates of the Laplacian.
Asymptotic spectral gap and Weyl law for Ruelle resonances of open partially expanding maps
Jean-Fran?ois Arnoldi,Frédéric Faure,Tobias Weich
Mathematics , 2013, DOI: 10.1017/etds.2015.34
Abstract: We consider a simple model of an open partially expanding map. Its trapped set K in phase space is a fractal set. We first show that there is a well defined discrete spectrum of Ruelle resonances which describes the asymptotics of correlation functions for large time and which is parametrized by the Fourier component \nu on the neutral direction of the dynamics. We introduce a specific hypothesis on the dynamics that we call "minimal captivity". This hypothesis is stable under perturbations and means that the dynamics is univalued on a neighborhood of K. Under this hypothesis we show the existence of an asymptotic spectral gap and a Fractal Weyl law for the upper bound of density of Ruelle resonances in the semiclassical limit \nu -> infinity. Some numerical computations with the truncated Gauss map illustrate these results.
Un cadre de conception pour réunir les modèles d'interaction et l'ingénierie des interfaces
Jér?me Lard,Frédéric Landragin,Olivier Grisvard,David Faure
Computer Science , 2008,
Abstract: We present HIC (Human-system Interaction Container), a general framework for the integration of advanced interaction in the software development process. We show how this framework allows to reconcile the software development methods (such MDA, MDE) with the architectural models of software design such as MVC or PAC. We illustrate our approach thanks to two different types of implementation for this concept in two different business areas: one software design pattern, MVIC (Model View Interaction Control) and one architectural model, IM (Interaction Middleware).
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