Thick isotopy property and the mapping class groups of Heegaard splittings

Abstract

We give a necessary and sufficient condition for the fundamental group of the space of Heegaard splittings of an irreducible $3$-manifold to be finitely generated. The condition is exactly the conclusion of the thick isotopy lemma proved by Colding, Gabai and Ketover, which says that any isotopy of a Heegaard surface is achieved by a $1$-parameter family of surfaces with area bounded above by a universal constant and with some ``thickness property''. We also prove that a Heegaard splitting of a hyperbolic or spherical $3$-manifold satisfies the condition if it is topologically minimal (in the sense of Bachman) and its disk complex has finitely generated homotopy group. In conclusion, such a Heegaard splitting has finitely generated mapping class group.

22 pages, 5 figures. Added Section 6 and Appendix A

References in corpus (2)

• Automorphisms of the 3-sphere that preserve a genus two Heegaard splitting
• Powell moves and the Goeritz group