Locally compact piecewise full groups of homeomorphisms

Abstract: We study when a piecewise full group (a.k.a. topological full group) of homeomorphisms of the Cantor space $X$ can be given a non-discrete totally disconnected locally compact (t.d.l.c.) topology and give a criterion for the alternating full group (in the sense of Nekrashevych's group A(G) to be compactly generated. As a result, starting from qualitative criteria, we obtain a large class of t.d.l.c. groups such that the derived group is non-discrete, compactly generated, open and simple, putting previous constructions of Neretin, Roever and Lederle in a more systematic context. We also show some notable properties of Neretin's groups apply to this class in general. General consequences are derived for the theory of simple t.d.l.c. groups, prime among them the universal role that alternating full groups play in the class of simple t.d.l.c. groups that are non-discrete, compactly generated and locally decomposable. Some of the theory is developed in the setting of topological inverse monoids of partial homeomorphisms of $X$. In particular, we obtain a sufficient condition to extend the topology to a monoid equipped with all restrictions with respect to compact open subsets of $X$ and all joins of compatible pairs of elements. The compact generation criterion is also naturally expressed in this context.