Semifree Hamiltonian circle actions on 6-dimensional symplectic manifolds with non-isolated fixed point set

Yunhyung Cho, Taekgyu Hwang, Dong Youp Suh

Let $(M,\omega )$ be a 6-dimensional closed symplectic manifold with a symplectic $S^1$-action with $M^{S^1}\ne \varnothing$ and $\dim M^{S^1}\le 2$. Assume that $\omega$ is integral with…