Event Category: String Seminar

String Seminar:
Tuesdays at 3:40pm on campus

–

Abstract: We discuss a two-step mechanism to create a new inflationary domain beyond a wormhole throat which is created by a phase transition around an evaporating black hole. The first step is creation of a false vacuum bubble with a thin-wall boundary by the thermal effects of Hawking radiation around an evaporating black hole. Then this wall induces a quantum … Read More

–

Abstract: We compute the four-point function of scalar operators in CFTs with weakly broken higher spin symmetry at arbitrary ‘t Hooft coupling. We use the known three-point functions in these theories, the Lorentzian OPE inversion formula and crossing to fix the result up to the addition of two functions of the cross ratios. These are given by contact Witten diagrams … Read More

–

Abstract: We will discuss Newton-Cartan geometry and its applications within condensed matter physics. Newton-Cartan geometry provides an efficient means to impose Galilean spacetime symmetries within field theory and couple systems to curved spacetime geometries, which has historically been much trickier than the relativistic case. We will review these issues and discuss applications to experimentally realizable systems such as spinor BECs … Read More

–

Abstract: I will explain work with Hirosi Ooguri using the AdS/CFT correspondence to establish the following old conjectures about quantum gravity: 1) there are no global symmetries, 2) gauge symmetries are allowed but the gauge group must be compact, 3) there must be dynamical objects transforming in all irreducible representations of the gauge group. I will spend considerable time discussing … Read More