# NCG

## Seminar

### Topological boundary maps in physics, general theory and applications

Kellendonk, J (Claude Bernard Lyon 1)
Tuesday 19 December 2006, 16:30-17:00

Seminar Room 1, Newton Institute

#### Abstract

$K$-theory boundary maps and their duals in cyclic cohomology are used to relate topological invariants of bulk and boundary in physical systems. We explain in particular an application to potential scattering thus providing a topological explanation of Levinson's theorem.