Abstract
In the first part of this paper we study different blow-upconstructions on symplectic orbifolds. Unlike the manifold case,we can define different blow-ups by using different circleactions. In the second part, we use some of these constructions todescribe the behavior of reduced spaces of a Hamiltonian circleaction on a symplectic orbifold, when passing a critical level ofits Hamiltonian function. Using these descriptions, we generalize,in the manifold case, the wall-crossing theorem of Guillemin and Sternberg to the case of a Hamiltonian torus action not necessarily quasi-free and also the Duistermaat–Heckman theorem to intervalsof values of the Hamiltonian function containing critical values.
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Godinho, L. Blowing Up Symplectic Orbifolds. Annals of Global Analysis and Geometry 20, 117–162 (2001). https://doi.org/10.1023/A:1011628628835
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DOI: https://doi.org/10.1023/A:1011628628835