A symmetry is usually described by transformations and an
associated group. However, a symmetry can also be described by
the conservation of charges, encoded by their fusion rule. This
leads to a description of symmetry based on fusion category...
We will discuss the geometry behind the horizon of various
asymptotically AdS black holes when the boundary CFT is deformed by
a scalar operator. The dynamics of classical GR in the region
inside the black hole turns out to be rather intricate, with...
We consider the universality of existence and saturation of
asymptotic bounds in various quantities in 2D CFT. In particular,
we focus on previously derived upper and lower bounds on the number
of operators in a window of scaling dimensions [Δ−δ,Δ+δ...
A fascinating feature of some gapped systems is topological
order, where the system flows to a nontrivial TQFT in the infrared.
The gap is often essential to the description of these phases, so
it is interesting to ask what happens to them when the...
Spacetime wormholes have played an important role in
recent progress in black hole physics. However, in the context of
AdS/CFT, these wormholes lead to a basic puzzle: the "factorization
problem", introduced by Maldacena and Maoz. In this talk we...
We show that a naïve application of the quantum extremal surface
(QES) prescription can lead to paradoxical results and must be
corrected at leading order. The corrections arise when there is a
second QES (with strictly larger generalized entropy at...
There are a few well-known ways for quantum mechanical,
many-body systems to avoid coming to thermal equilibrium. For
example, we know of two classes of systems -- integrable systems,
and many-body localized systems -- for which conservation
laws...
I will discuss properties of phases of matter in systems with a
global U(1) symmetry and a (possibly discrete) translation
symmetry. The low energy theory of such systems is strongly
constrained by these symmetries. I will give a framework to...
