Video Lectures

Symmetries of Cosmological Cauchy Horizons with Non-Closed Orbits

June 13, 2019

Jim Isenberg

We consider analytic, vacuum spacetimes that admit compact, non-degenerate Cauchy horizons. Many years ago Vince Moncrief and I proved that, if the null geodesic generators of such a horizon were all closed curves, then the enveloping spacetime...

video lecture

Stability of the spacetime positive mass theorem in spherical symmetry

June 13, 2019

Marcus Khuri

We formulate a conjecture for the almost rigidity statement associated with the spacetime version of the positive mass theorem, and give examples to show how it is basically sharp if true. Furthermore we establish the conjecture under the assumption...

video lecture

Geometric Extremization for Supersymmetric $AdS_3$ and $AdS_2$ Solutions

June 05, 2019

Jerome Gauntlett

We consider supersymmetric $AdS_3\times Y_7$ solutions of type IIB supergravity dual to N=(0,2) SCFTs in d=2, as well as $AdS_2\times Y_9$ solutions of D=11 supergravity dual to N=2 supersymmetric quantum mechanics, some of which arise as the near...