Event Details

I will show that the isometry group of asymptotically flat spacetimes contains, in addition to the BMS group, a new dual supertranslation symmetry. The corresponding new conserved charges are akin to the large magnetic U(1) charges in QED and they reveal a rich topological structure exhibited by the asymptotic metric as well as by the Hilbert space of asymptotic states. I will describe this structure and some resulting applications, including a new gravitational duality analogous to electricmagnetic duality in field theory.