Unboundedness of some higher Euler classes

Abstract

In this paper, we study Euler classes in groups of homeomorphisms of Seifert fibered 3-manifolds. We show that, in contrast to the familiar Euler class for \(\mathrm{Homeo}_0(S^1)^\delta\), these Euler classes for \(\mathrm{Homeo}_0(M^3)^\delta\) are unbounded classes. In fact, we give examples of flat topological M bundles over a genus 3 surface whose Euler class takes arbitrary values.