Mathematics – Symplectic Geometry
Scientific paper
2007-01-31
Noncommutative geometry and physics 2005, 31--54, World Sci. Publ., Hackensack, NJ, 2007.
Mathematics
Symplectic Geometry
Scientific paper
We show that the quotient associated to a quasi-Hamiltonian space has a symplectic structure even when 1 is not a regular value of the momentum map: it is a disjoint union of symplectic manifolds of possibly different dimensions, which generalizes a result of Alekseev, Malkin and Meinrenken. We illustrate this theorem with the example of representation spaces of surface groups. As an intermediary step, we show that the isotropy submanifolds of a quasi-Hamiltonian space are quasi-Hamiltonian spaces themselves.
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