On spherical space forms with meta-cyclic fundamental group which are isospectral but not equivariant cobordant
On stabilization and control for the critical Klein-Gordon equation on a 3-D compact manifold
We study the internal stabilization and control of the critical nonlinear Klein-Gordon equation on 3-D compact manifolds. Under a geometric assumption slightly stronger than the classical geometric control condition, we prove exponential decay for some solutions bounded in the energy space but small in a lower norm. The proof combines profile decomposition and microlocal arguments. This profile decomposition, analogous to the one of Bahouri-Gérard [2] on , is performed by taking care of possible...
On super (or pseudo) differential forms as superfunctions
On the absence of Poincaré lemma for some systems of partial differential equations
On the absence of the one-sided Poincaré lemma in Cauchy-Riemann manifolds
Given an embeddable manifold and a non-characteristic hypersurface we present a necessary condition for the tangential Cauchy-Riemann operator on to be locally solvable near a point in one of the sidesdetermined by .
On the Analytic Continuation of Rank One Eisenstein Series.
On the asymptotic behavior of Dirichlet problems in a riemannian manifold less small random holes
On the best observation of wave and Schrödinger equations in quantum ergodic billiards
This paper is a proceedings version of the ongoing work [20], and has been the object of the talk of the second author at Journées EDP in 2012.In this work we investigate optimal observability properties for wave and Schrödinger equations considered in a bounded open set , with Dirichlet boundary conditions. The observation is done on a subset of Lebesgue measure , where is fixed. We denote by the class of all possible such subsets. Let . We consider first the benchmark problem of maximizing...
On the Burns-Epstein invariants of spherical CR 3-manifolds
In this paper we develop a method to compute the Burns-Epstein invariant of a spherical CR homology sphere, up to an integer, from its holonomy representation. As an application, we give a formula for the Burns-Epstein invariant, modulo an integer, of a spherical CR structure on a Seifert fibered homology sphere in terms of its holonomy representation.
On the -singularities of regular holonomic distributions
The analytic and wave-front sets of a distribution which is a solution of a regular holonomic differential system are shown to coincide. More generally, we give comparison theorems for solutions of a regular holonomic system of microdifferential equations in various spaces of microfunctions, as a simple extension of a result of Kashiwara.
On the characteristic initial value problem for nonlinear symmetric hyperbolic systems, including Einstein equations [Book]
On the characterizations of flat metrics by the spectrum.
On the compactness theorem for differential forms.
On the complex of Sobolev spaces associated with an abstract Hilbert complex.
On the composition structure of the twisted Verma modules for
We discuss some aspects of the composition structure of twisted Verma modules for the Lie algebra , including the explicit structure of singular vectors for both and one of its Lie subalgebras , and also of their generators. Our analysis is based on the use of partial Fourier tranform applied to the realization of twisted Verma modules as -modules on the Schubert cells in the full flag manifold for .
On the connectedness of the space of initial data for the Einstein equations.
On the construction of fundamental solutions for differential operators on nilpotent groups
On the Curvature and Heat Flow on Hamiltonian Systems
We develop the differential geometric and geometric analytic studies of Hamiltonian systems. Key ingredients are the curvature operator, the weighted Laplacian, and the associated Riccati equation.We prove appropriate generalizations of the Bochner-Weitzenböck formula and Laplacian comparison theorem, and study the heat flow.
On the determinant of an Hodge-de Rham like operator.
On the differential form spectrum of hyperbolic manifolds
We give a lower bound for the bottom of the differential form spectrum on hyperbolic manifolds, generalizing thus a well-known result due to Sullivan and Corlette in the function case. Our method is based on the study of the resolvent associated with the Hodge-de Rham laplacian and leads to applications for the (co)homology and topology of certain classes of hyperbolic manifolds.