Some results on Multiplicity-free spaces

Details Some results on Multiplicity-free spaces Some results on Multiplicity-free spaces

2004-02-17

arxiv.org/abs/math/0402277v4

Mathematics

Differential Geometry

v1: 7 pages, added refernces and changed content v2: 22 may 2006, 12 pages, completely rewritten

Scientific paper

Let $(M,\omega)$ be a connected symplectic manifold on which a connected Lie group $G$ acts properly and in a Hamiltonian fashion with moment map $\mu:M \lra \mf g^*$. Our purpose is investigate multiplicity-free actions, giving criteria to decide a multiplicity freenes of the action. As an application we give the complete classification of multiplicity-free actions of compact Lie groups acting isometrically and in a Hamiltonian fashion on Hermitian symmetric spaces of noncompact type. Successively we make a connection between multiplicity-free actions on $M$ and multiplicity-free actions on the symplectic reduction and on the symplectic cut, which allow us to give new examples of multiplicity-free actions.

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