Affine closure of T*O_n in sl_n is isomorphic via C*-Hamiltonian reduction to the minimal nilpotent orbit closure in so_{2n+2}, and has no symplectic resolution.
Mukai, The order of the attaching class in the suspended quaternionic quasiprojective space, Publ
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Constructs topological elliptic genera as G-equivariant refinements of classical elliptic genera and derives a divisibility result for Euler numbers of Sp-manifolds.
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A connection between minimal nilpotent orbits of types A and D via Hamiltonian reduction
Affine closure of T*O_n in sl_n is isomorphic via C*-Hamiltonian reduction to the minimal nilpotent orbit closure in so_{2n+2}, and has no symplectic resolution.