Video Lectures

On-shell methods have found a new application to local observables such as asymptotic radiation fields and gravitational waveforms. While these observables are invariant under small gauge transformations, they are known to depend on a choice of...

On general grounds one expects that global symmetries are absent in quantum gravity. We discuss some aspects of this issue, focusing on the recently proposed Swampland Cobordism Conjecture, and related conjectures connected with completeness of the...

Observations of fluctuations in the CMB provide information about primordial inhomogeneities in the universe. However, the B-mode polarization of the inflationary gravitational wave is contaminated by the Galactic dust and synchrotron foreground...

I will describe the relationship between the Schur indices of 4d N=2 SQFTs of class S and the quantization of Chern-Simons theory with complex gauge group.

Correlation functions of the average null energy operator provide direct theoretical models of collider experiments, and have played a crucial role in contemporary developments in formal QFT and gravity. Recently it has become possible to directly...

I will explain how to realize a gapped Hamiltonian for a (1+1)d system on the lattice which has a categorical symmetry given by the modules of the 4-dimensional Taft algebra. This category is finite but not a fusion category, a fact that presents...

In the search for simple, solvable models of quantum cosmology it is useful to focus on general relativity in 2+1 dimensions, where - due to the absence of local degrees of freedom - there is some hope that we can say something precise.  I will...