5 papers
Dynamical propagation and Roe algebras of warped spaces
Tim de Laat, Federico Vigolo, Jeroen Winkel
Given a non-singular action , we define the -algebra of operators of finite dynamical propagation associated w…
Coarse fixed point properties
Romain Tessera, Jeroen Winkel
We investigate fixed point properties for isometric actions of topological groups on a wide class of metric spaces, with a particular emphasis on Hilbert spaces. Instead of requiri…
Cycles in graphs with geometric property (T)
Jeroen Winkel
We show that a sequence of graphs with geometric property (T) has many small cycles. We also show that when a small part of a sequence of graphs with geometric property (T) is chan…
Geometric property (T) for non-discrete spaces
Jeroen Winkel
Geometric property (T) was defined by Willett and Yu, first for sequences of graphs and later for more general discrete spaces. Increasing sequences of graphs with geometric proper…
The fundamental group of a noncommutative space
Walter D. van Suijlekom, Jeroen Winkel
We introduce and analyse a general notion of fundamental group for noncommutative spaces, described by differential graded algebras. For this we consider connections on finitely ge…