# Noncontractible Hamiltonian loops in the kernel of Seidel’s representation

@article{Anjos2016NoncontractibleHL, title={Noncontractible Hamiltonian loops in the kernel of Seidel’s representation}, author={S{\'i}lvia Anjos and R'emi Leclercq}, journal={Pacific Journal of Mathematics}, year={2016}, volume={290}, pages={257-272} }

The main purpose of this note is to exhibit a Hamiltonian diffeomorphism loop undetected by the Seidel morphism of certain 2-point blow-ups of $S^2 \times S^2$, exactly one of which being monotone. As side remarks, we show that Seidel's morphism is injective on all Hirzebruch surfaces and discuss how to adapt the monotone example to the Lagrangian setting.

## One Citation

### Elliptic diffeomorphisms of symplectic $4$-manifolds

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We show that symplectically embedded $(-1)$-tori give rise to certain elements in the symplectic mapping class group of $4$-manifolds. An example is given where such elements are proved to be of…

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