# Geometry at Infinity

Priority programme of the DFG

## Welcome to SPP 2026

This is the platform of a coordinated research programme in mathematics, funded by the German Research Foundation (DFG).  It comprises 33 research projects in the fields of differential geometry, geometric topology, and global analysis. More than 80 researchers from doctoral to professorial level and based at more than 20 German and Swiss universities are represented in this programme.

## Latest publications

#### The Baum--Connes conjecture localised at the unit element of a discrete groupPaolo Antonini, Sara Azzali, Georges Skandalis

We construct a Baum--Connes assembly map localised at the unit element of a discrete group $\Gamma$.
This morphism, called $\mu_\tau$, is defined in...

#### S-arithmetic spinor groups with the same finite quotients and distinct ℓ²-cohomologyHolger Kammeyer, Roman Sauer

In this note we refine examples by Aka from arithmetic to S-arithmetic groups to show that the vanishing of the i-th ℓ²-Betti number is not a...