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.
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The authors classify all finite group actions on cubic threefolds that make the threefold G-birationally rigid.
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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.
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G-birationally rigid cubic threefolds
The authors classify all finite group actions on cubic threefolds that make the threefold G-birationally rigid.