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Algebraic Hamiltonian actions.

星期一, 26 六月, 2006 - 12:30
Prénom de l'orateur : 
Ivan
Nom de l'orateur : 
LOSEV
Résumé : 

This talk is devoted to Hamiltonian actions
of reductive groups on affine Poisson varieties. More
precisely, let $X$ be an affine Poisson variety
with a Hamiltonian action of a reductive group
$G$ and the moment map $mu:X
ightarrow Lie(G)$.
We prove that, under some additional restrictions,
the corresponding morphism of quotients
$X//G
ightarrow Lie(G)//G$ is equidimensional. Next,
we study the affine Stein factorization of this
morphism. Our results partially generalize those
of F. Knop.

Institution de l'orateur : 
Université de Moscou
Thème de recherche : 
Algèbre et géométries
Salle : 
04
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