Title : Finite group actions on homology $3$-spheres and cyclic branched coverings of knots and links
Speaker : Bruno Zimmermann (Universite degli Studi Trieste)
Abstract :

We report on recent work on the determination of the finite groups which admit actions on integer and $\Bbb Z/2$-homology 3-spheres. We apply this to the following problem: how many different knots in the 3-sphere can have the same hyperbolic 3-manifold $M$ as their common 2-fold branched covering, and how are these related.

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