Kernel of the variation operator and periodicity of the open books

Details Kernel of the variation operator and periodicity of the open books Kernel of the variation operator and periodicity of the open books

2003-08-28

arxiv.org/abs/math/0308277v2

Mathematics

Geometric Topology

This is a revision and extension of the version which was accepted for publication in "Topology and its Applications"

Scientific paper

We consider a parallelizable $2n$-manifold $F$ which has the homotopy type of the wedge product of $n$-spheres and show that the group of pseudo-isotopy classes of orientation preserving diffeomorphisms that keep the boundary $\partial F$ pointwise fixed and induce the trivial variation operator is a central extension of the group of all homotopy $(2n+1)$-spheres by $H_n\bigl(F; S\pi_n(SO(n))\bigr)$. Then we apply this result to study the periodicity properties of branched cyclic covers of manifolds with simple open book decompositions and extend the previous results of Durfee, Kauffman and Stevens to dimensions 7 and 15.

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