Maximal tori in the contactomorphism groups of circle bundles over Hirzebruch surfaces

Details Maximal tori in the contactomorphism groups of circle bundles over Hirzebruch surfaces Maximal tori in the contactomorphism groups of circle bundles over Hirzebruch surfaces

2002-04-28

arxiv.org/abs/math/0204334v1

Mathematics

Symplectic Geometry

7 pages

Scientific paper

In a recent preprint Yael Karshon showed that there exist non-conjugate tori in a group of symplectomorphisms of a Hirzebruch surface. She counted them in terms of the cohomology class of the symplectic structure. We show that a similar phenomenon exists in the contactomorphism groups of pre-quantum circle bundles over Hirzebruch surfaces. Note that the contact structures in question are fillable. This may be contrasted with an earlier paper where we showed that there are infinitely many non-conjugate tori in the contactomorphism groups of certain overtwisted lens spaces (Contact cuts, Israel J. Math, 124(2001), 77--92).

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