Physics

Abstract: I will review a series of results regarding the extremal limit of generic black holes in both Einstein and Einstein-Maxwell theory. We will see that in AdS, at low temperatures, large tidal forces arise at the horizon. These tidal forces...

Abstract: 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.

Abstract: Celebrating a hundred years of quantum mechanics, the United Nations has declared 2025 the International Year of Quantum Science and Technology. This is not only an occasion to step back and marvel at the progress, it also raises the...

Abstract: A new manifestly spacetime-supersymmetric prescription for superstring amplitude computations is given using the pure spinor formalism which does not contain subtleties from poles in the pure spinor ghosts. This super-Poincare covariant...

Abstract: 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...

Abstract: 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...

Abstract: In the last few years, a method has been developed for using unitarity to constrain the space of possible expectation values in quantum mechanical systems. I will review this method and discuss some recent developments involving time...

Abstract: 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...

Abstract: We use asymptotic symmetry arguments to show that the only physical states in QED scattering theory are maximally entangled states, in which electron (or positron) momenta at timelike infinity are entangled with soft radiation with memory...

Abstract: I will discuss how one may construct Floquet models from a fusion category, and how this formalism is a natural way to construct topological defects: non-local operators that can be deformed in the space and time direction without...