Maths HEP Lunchtime Seminars: Gravitational Instantons from Gauge Theory
24 February 2006 13:00 in CM221
"Gauge theory can be formulated on noncommutative (NC) spacetime. This NC gauge theory has an equivalent dual description through the so-called Seiberg-Witten (SW) map in terms of ordinary gauge theory on commutative spacetime. We show that all U(1) instantons on NC spacetime are mapped to gravitational instantons by the exact SW map and that the topological invariants of the gravitational instantons are perfectly matched with stringy corrections to the Wess-Zumino term in D-brane effective actions. "