February 25, 2020 @ 11:30 am – 12:30 pm
The title: “A new topological symmetry of asymptotically flat spacetimes”
I will show that asymptotically flat spacetimes are invariant, in addition to the BMS group, under 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 topologicalstructure exhibited by the asymptotic metric as well as by the Hilbert space of asymptotic states. Among the results that I will describe in this talk are the construction of a gravitational-magnetic monopole solution analogous to the Wu-Yang monopole in QEDand the discovery of a new gravitational duality akin to electric-magnetic duality in field theory.