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Theses

Structures géométriques liées aux algèbres de Lie graduées

Abstract : The goal of this thesis is to define a geometric objet associated to graded Lie algebras. In the case of a $\mathbb{Z}/2\mathbb{Z}$ graded Lie algebra, this object is a symmetric space G/H and the infinitesimal object associated is a Lie triple system. If the Lie algebra is 3-graded, the geometry is called a generalized projective geometry and the infinitesimal object is a Jordan pair. In the general case, the geometric object will be called a generalized flag geometry. Its contruction needs the notions of elementary projective group and projective completion, definied by O. Loos and used by J. R. Faulkner. Then, by the notion of filtrations of a Lie algebras, a realization of the generalized flag geometry of a graded Lie algebra can be done as orbits under the elementary projective group of two natural filtrations, associated to the graduation. In the example $\mathfrak{g}=End_R(V)$, consisting of the endomorphisms of a module $V$ on a assocative algebra $R$, then the generalized flag geometry is realized like orbits of flags of $V$; so, it justifies the chosen name: "generalized flag geometry". To finish, using a generalized differential calculus, we can construct on this generalized flag geometry a structure of smooth manifold
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Julien Chenal. Structures géométriques liées aux algèbres de Lie graduées. Mathématiques générales [math.GM]. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10036⟩. ⟨tel-01748201⟩

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