Abstract: Recent developments in massive
on-shell scattering amplitudes in 4D have opened the door to
understanding particle physics efficiently from an on-shell
point-of-view, including on-shell notions of minimal coupling and
black holes as...
Abstract: I will talk about the invariants of
topologically ordered states of quantum lattice systems that
generalize Berry classes and can be defined for any gapped state in
any dimension. The equivariant version of such invariants unifies
and...
Abstract: While von Neumann entropies for
local subregions in quantum field theory universally contain
ultraviolet divergences, there is widespread belief that
differences between von Neumann entropies can be finite and
well-defined in many...
Abstract: Recently, it has been argued
that in certain settings, the entropy of a region in semiclassical
quantum gravity can be computed in a UV-finite way using tools from
the theory of operator algebras. I will attempt to formulate the
most...
Abstract: Kinematically, massless particles in
Lorentz-invariant theories are classified by a dimensionful "spin
scale"ρ (2nd Casimir invariant) that characterizes
helicity states' mixing under little group transformations.
However, dynamics for...
Abstract: Historically tensor networks
have been helpful models of AdS/CFT, but there have always been
some aspects that they fail to capture, particularly those
involving the time direction. In this talk I will take the
perspective that we can...
Abstract: We discuss shockwave geometries
and the connections to aspects of flat space holography. We first
show how the ’t Hooft commutation relations of shockwave
operators are equivalent to the commutation relation between
soft and Goldstone...
Abstract: Scattering amplitudes for the
simplest theory of colored scalars— Tr $\phi^3$ theory — have been
understood as arising from a counting problem associated with
curves on a surface (arXiv:2309.15913v1). This formulation produces
“stringy”...
Abstract: I discuss physical motivations
from black hole physics and holography for expecting finite quantum
entanglement entropy in quantum gravity. I describe recent and
earlier results in defining such a notion in perturbative string
theory by a...
