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Singularités libres, formes et résidus logarithmiques

Abstract : The theory of logarithmic vector fields and logarithmic differential forms along a reduced singular hypersurface is developed by K. Saito. These notions appear in the study of the Gauss-Manin connection of some families of singularities and their semi-universal unfolding. If the module of logarithmic vector fields is free, the hypersurface is called a free divisor. A.G. Aleksandrov and A. Tsikh generalize the notions of logarithmic differential forms and logarithmic residues to reduced complete intersections and Cohen-Macaulay spaces. In this work, we study the logarithmic differential forms of a reduced singular space of any codimension embedded in a smooth manifold, and we develop a notion of free singularity which extend the notion of free divisor. The residues of logarithmic differential forms as well as theirgeneralization to higher codimension spaces are crucial in this thesis. Our first purpose is to give characterizations of freeness for complete intersections and Cohen-Macaulay spaces which generalize the case of hypersurfaces. We then give a particular attention to a family of free singularities, namely the curves, for which we describe the module of logarithmic residues thanks to their set of values.
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Submitted on : Thursday, January 19, 2017 - 5:23:16 PM
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Delphine Pol. Singularités libres, formes et résidus logarithmiques. Mathématiques générales [math.GM]. Université d'Angers, 2016. Français. ⟨NNT : 2016ANGE0021⟩. ⟨tel-01441450⟩



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