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math.SG2004★ 9 cited
Free circle actions with contractible orbits on symplectic manifolds
D. Kotschick
We prove that closed symplectic four-manifolds do not admit any smooth free circle actions with contractible orbits, without assuming that the actions preserve the symplectic forms…
math.SG2003★ 22 cited
Signatures of foliated surface bundles and the symplectomorphism groups of surfaces
D. Kotschick, S. Morita
For any closed oriented surface F of genus at least three, we prove the existence of foliated F-bundles over surfaces such that the signatures of the total spaces are non-zero. We…