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     <dc:title xml:lang="fr">Compactification du Feuilletage de Painlevé V</dc:title>
     <dcterms:alternative xml:lang="en">Compactification of the Painlevé V foliation</dcterms:alternative>
     <dc:subject xml:lang="fr">Déformations isomonodromiques</dc:subject><dc:subject xml:lang="fr">Équations de Painlevé</dc:subject><dc:subject xml:lang="fr">Espace des modules des connexions</dc:subject>
     <dc:subject xml:lang="en">Isomonodromic deformations</dc:subject><dc:subject xml:lang="en">Painlevé equations</dc:subject><dc:subject xml:lang="en">Moduli space of connections</dc:subject>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="076313409">Déformations isomonodromiques, Méthode des</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="077066693">Équations de Painlevé</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Le but de cette thèse est de compactifier le feuilletage isomonodromique induit par l'équation Painlevé V. En particulier, nous analysons le comportement asymptotique des solutions de cette équation lorsque le paramètre de temps tend vers 0 ou l'infini. Pour ce faire, nous devons d’abord compactifier l’espace ambiant du feuilletage. Cet espace correspond à l’espace de modules d’une certaine classe de connexions méromorphes de rang deux sur la sphère de Riemann, présentant deux singularités régulières, ainsi qu’une singularité irrégulière d’ordre deux. La compactification que nous proposons étend et affine la compactification d’Okamoto en intégrant des composantes de bord liées au paramètre temporel égal à 0 ou l'infini. Nous interprétons les connexions limites comme des connexions sur des courbes nodales rationnelles irrégulières stables. De telles connexions se décomposent en connexions méromorphes plus simples, une pour chaque composante lisse de la courbe. Les données spectrales résiduelles de ces connexions en chaque noeud fournissent un intégrale première pour le champ Hamiltonien associé à l’équation de Painlevé V. Grâce à ces données, nous pouvons déterminer le comportement du feuilletage sur les composantes de bord.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">The goal of this thesis is to compactify the leaves of the isomonodromic foliation induced by the fifth Painlevé equation. In particular, we analyze the asymptotic behavior of the solutions of the fifth Painlevé equation as the time parameter tends to 0 or infinity. To achieve this, we first need to compactify the ambient space of the foliation. This space corresponds to the moduli space of a certain class of rank-two meromorphic connections on the Riemann sphere, featuring two regular singularities, and an irregular singularity of order two. The compactification we present extends and refines the Okamoto compactification by incorporating boundary components related to the time parameter equal to 0 or infinity. We interpret the limit connections as connections on irregular rational stable nodal curves. Such connections decompose into simpler, standard meromorphic connections, one for each smooth component of the curve. The residual spectral data of these connections at the nodes provides a first integral for the Hamiltonian vector field associated with the fifth Painlevé equation. Using this data, we are able to determine the behavior of the foliation on the boundary components.</dcterms:abstract>
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       <tef:nom>Morbello</tef:nom>
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