Generalized flag geometries associated with (2k + 1)-graded Lie algebras

Details Generalized flag geometries associated with (2k + 1)-graded Lie algebras Generalized flag geometries associated with (2k + 1)-graded Lie algebras

2010-07-23

arxiv.org/abs/1007.4076v1

Mathematics

Rings and Algebras

Scientific paper

In this paper, we present the construction of a geometric object, called a generalized flag geometry, $(X^+;X^-)$, corresponding to a (2k +1)-graded Lie algebra $g=g_k\oplus\dots\oplus g_{-k}$. We prove that $(X^+;X^-) can be realized inside the space of inner filtrations of g and we use this realization to construct "algebraic bundles" on $X^+$ and $X^-$ and some sections of these bundles. Thanks to these constructions, we can give a realization of $g$ as a Lie algebra of polynomial maps on the positive part of $g$, $n^+_1:=g_1\oplus\dots\oplus g_k$, and a trivialization in $n^+_1$ of the action of the group of automorphisms of $g$ by "birational"maps.

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