Puits multiples pour l'opérateur de Dirac
Resonances of N-body Schrödinger operators with stark effect
Resonant perturbation theory of decoherence and relaxation of quantum bits.
Résultats de finitude pour les lacunes spectrales
Résurgence de Voros et périodes des courbes hyperelliptiques
Le but de cet article est de formuler de façon géométrique l’idée maîtresse de Voros dans Ann. Inst. Henri Poincaré, Sect. A 39, 211-238 (1983) : les solutions de l’équation de Schrödinger stationnaire à une dimension, à potentiel polynomial, sont codées exactement dans le domaine complexe par leurs développements BKW (développements formels, divergents, en puissances de la constante de Planck), d’une façon entièrement lisible dans la géométrie des périodes de la forme (=variable de position,...
Semiclassical analysis of low lying eigenvalues. I. Non degenerate minima : asymptotic expansions
Semiclassical analysis of low lying eigenvalues. I. Non-degenerate minima : asymptotic expansions
Singular eigenfunctions of Calogero-Sutherland type systems and how to transform them into regular ones.
Spectrum of the laplacian in a narrow curved strip with combined Dirichlet and Neumann boundary conditions
We consider the laplacian in a domain squeezed between two parallel curves in the plane, subject to Dirichlet boundary conditions on one of the curves and Neumann boundary conditions on the other. We derive two-term asymptotics for eigenvalues in the limit when the distance between the curves tends to zero. The asymptotics are uniform and local in the sense that the coefficients depend only on the extremal points where the ratio of the curvature radii of the Neumann boundary to the Dirichlet one...
Spectrum of the Laplacian in a narrow curved strip with combined Dirichlet and Neumann boundary conditions
We consider the Laplacian in a domain squeezed between two parallel curves in the plane, subject to Dirichlet boundary conditions on one of the curves and Neumann boundary conditions on the other. We derive two-term asymptotics for eigenvalues in the limit when the distance between the curves tends to zero. The asymptotics are uniform and local in the sense that the coefficients depend only on the extremal points where the ratio of the curvature radii of the Neumann boundary to the Dirichlet one...
Spectrum of the Laplacian in narrow tubular neighbourhoods of hypersurfaces with combined Dirichlet and Neumann boundary conditions
We consider the Laplacian in a domain squeezed between two parallel hypersurfaces in Euclidean spaces of any dimension, subject to Dirichlet boundary conditions on one of the hypersurfaces and Neumann boundary conditions on the other. We derive two-term asymptotics for eigenvalues in the limit when the distance between the hypersurfaces tends to zero. The asymptotics are uniform and local in the sense that the coefficients depend only on the extremal points where the ratio of the area of the Neumann...
The microlocal Landau-Zener formula
The projected single-particle Dirac operator for Coulombic potentials.
The quantum stability problem for time-periodic perturbations of the harmonic oscillator
The return of the quartic oscillator. The complex WKB method
The role of locality in perturbation theory
The time-dependent Born-Oppenheimer approximation
We explain why the conventional argument for deriving the time-dependent Born-Oppenheimer approximation is incomplete and review recent mathematical results, which clarify the situation and at the same time provide a systematic scheme for higher order corrections. We also present a new elementary derivation of the correct second-order time-dependent Born-Oppenheimer approximation and discuss as applications the dynamics near a conical intersection of potential surfaces and reactive scattering.
Über die Existenz von Wellenoperatoren für zeitabhängige Störungen.
Возмущение самосопряженного оператора подчиненным симметрическим оперaтором
Теория возмущений для основного синглетного состояния гейзенберговской антиферромагнитной цепочки спинов 1/2