Ahlfors-régularité des quasi-minima de Mumford–Shah

Utilisation des quasi-invariants géométriques pour l’appariement et la modélisation des images de segments de droite

Image matching consists in nding in two images the features which represent a same feature of the observed scene. It is a basic process of vision as soon as several images are used. In this paper, we propose a matching algorithm for two images, based on the use of local geometric quasi-invariants. Once a rst match is made, a projective approximation of the apparent motion and the epipolar geome...

Etude analytique de l'immunoprophylaxie de l'agalaxie contagieuse des chèvres et des moutons

Une Base Symétrique de l'Algèbre des Coinvariants Quasi-Symétriques

We describe a new basis of the ring of quasi-symmetric coinvariants, which is stable by the natural reversal of the set of variables. The indexing set is the set of triangulations of a regular polygon, instead of the set of Dyck paths used for the known basis.

Transitions Between de Sitter Minima

We investigate the cosmological signatures of instantons mediating tunneling between de Sitter minima. For generic potentials the Coleman-de Luccia instanton does not necessarily exist; when it does not, the instanton which contributes to the decay rate is the trivial constant solution, known as the Hawking-Moss instanton. With the aid of a toy model we interpret this solution and describe the ...

Fluctuations de densité dans des gaz de bosons ultrafroids quasi-unidimensionnels Density fluctuations in quasi one-dimensional ultracold bosonic gases

This thesis presents the design and implementation of a new generation of atom chips, that opennovel experimental possibilities with very anisotropic magnetic microtraps. The thermal propertiesof aluminum nitride atom chips are studied in detail. We have optimized the set-up in order totrap more atoms and image the clouds as precisely as possible. In particular we have fabricated a<...