Video Lectures

Recent horizon-scale images of Messier 87* and Sagittarius A* have been used to demonstrate that their spacetimes are well-described by the Kerr metric. The latter is a solution to the vacuum Einstein equations of general relativity, and is used to...

In this talk, I will review recent progress in understanding the complex multi-scale plasma physics of neutron star magnetospheres through the lens of first-principles particle-in-cell simulations. I will highlight pair production discharges near...

The TTbar deformation is a holographic theory describing holography a finite distance in the bulk.   If this theory can be UV completed, it could be a model of nonperturbative bulk quantum gravity.  However, it seems to be a non-unitary theory, as...

Many modern techniques to analyze global planetary signals, from satellite gravity and the geoid, to magnetic fields, to the making of seismological models, heavily rely on a global function basis - the spherical harmonics. When the available data...

We will discuss excitations with large spin and/or large particle number. For conformal theories this corresponds to investigating particular trajectories of heavy operators. 

We find trajectories with large approximate degeneracy and show that they...

Redshifted 21cm emission from neutral hydrogen is rapidly becoming one of our most powerful observables in cosmology. With it, we can study the evolution of dark energy at low/intermediate redshifts, the epoch of reionization, the first stars in the...

I will give a lightning review of results on this subject from 1988-1998 and then describe more recent developments, mostly current work in progress.  First, I will describe topological twisting of Lagrangian N=2 d=4 field theories in terms of the...

The connection between 3d pure gravity and Chern-Simons theory has been proposed and studied for decades. In this talk, I will give a brief review of the works 2304.13650 and 2401.13900 with Scott Collier and Lorenz Eberhardt, where we sharpen this...

Conformal Field Theory (CFT) represents a class of quantum field theories that has profound applications across various physics domains, from critical phenomena in statistical mechanics to quantum matter, quantum gravity, and string theory. In this...

I consider the operator product algebra along an observer's worldline as a background independent algebra in quantum gravity.