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math.SG2025
On the equivariant cohomological rigidity of semi-free Hamiltonian circle actions
Liat Kessler, Nikolas Wardenski
We consider semi-free Hamiltonian -manifolds of dimension six and establish when the equivariant cohomology and data on the fixed point set determine the isomorphism type. Gon…
math.SG2025
On isomorphisms of semi-free Hamiltonian -manifolds and fixed point data
Liat Kessler, Nikolas Wardenski
Following Gonzales, we answer the question of whether the isomorphism type of a semi-free Hamiltonian -manifold of dimension six is determined by certain data on the critical…
math.SG2022
Multiplicity free U(2)-actions and triangles
Oliver Goertsches, Bart Van Steirteghem, Nikolas Wardenski
We classify the compact, connected multiplicity free Hamiltonian U(2)-manifolds with trivial principal isotropy group whose momentum polytope is a triangle.