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Multiplicity free quasi-Hamiltonian manifolds (1612.03843v2)
Published 12 Dec 2016 in math.SG, math.DG, and math.RT
Abstract: A (quasi-)Hamiltonian manifold is called multiplicity free if all of its symplectic reductions are 0-dimensional. In this paper, we classify multiplicity free Hamiltonian actions for (twisted) loop groups or, equivalently, multiplicity free (twisted) quasi-Hamiltonian manifolds for simply connected compact Lie groups. As a result we recover old and find new examples of these structures.
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