The WessZuminoWitten (WZW) model is a 2 dimensional conformal field theory (CFT) where the field takes values in a Lie group G or its coset space. For a compact G this CFT is rational and its cosets G/H include for instance all unitary rational CFTs (e.g. the Ising model). WZW model has a formal path integral representation whose…
The HartreeFockBogoliubov approximation of superconducting ground states can be naturally described using Araki's selfdual canonical anticommutation relation (CAR) algebra. Using this framework, we first review the Ktheoretic classification of free fermions with an emphasis on unique gapped ground states. Ideas from index theory and coarse…
Much of the recent rigours progress on the classical Ising model was driven by new detailed understanding of its stochastic geometric representations  in particular the random current representation. Motivated by the problem of establishing exponential decay of truncated correlations of the supercritical Ising model in any dimension,Duminil…
Quantum computation is expected to outperform classical computation, yet understanding the origins of this advantage remains a fundamental challenge. In this talk, I will focus on the quantum feature, called magic, which can support the quantum advantage. I will introduce a quantum convolution to test and measure magic and discuss the possible…
 Kaifeng BuAffiliationHarvard UniversityPresentationMagic: A New Frontier of Quantum Science

Lévy matrices are symmetric random matrices whose entry distributions have power law tails and infinite variance. They are predicted to exhibit an Andersontype phase transition separating a region of delocalized eigenvectors from one with localized eigenvectors. We will discuss the context for this conjecture, and describe a result…
The Phi^4, and generally Phi^p measures, which are extensively studied in quantum field theory, also occur naturally as invariant Gibbs measures for certain (dispersive) Hamiltonian PDEs and parabolic SPDEs. A fundamental question is to rigorously justify the invariance of such measures under said dynamics, which leads to deep questions in the…
In recent years, experiments have shown that twisted bilayer graphene and other socalled ``moiré materials'' realize a variety of important stronglycorrelated electronic phases, such as superconductivity and fractional quantum anomalous Hall states. I will present a rigorous multiplescales analysis justifying the (singleparticle) Bistritzer…
As is well known, many materials freeze at low temperatures. Microscopically, this means that their molecules form a phase where there is long range order in their positions. Despite their ubiquity, proving that these freezing transitions occur in realistic microscopic models has been a significant challenge, and it remains an open problems in…
Entanglement is a fundamental property of quantum mechanics, and plays an increasing role in our understanding of manybody systems, in and out of equilibrium. In multipartite systems, different forms of entanglement can exist between various sets of particles, and its detection, even theoretical, remains an outstanding challenge. In this talk,…
Bulkedge correspondence is an important part of the theory of topological insulators which relates topological invariants in the bulk of an insulator to those of its topologically protected edge modes. Despite numerous rigorous proofs, this paradigm has recently been shown to fail in continuum models for topological phases where the…
I will give an overview of a perspective on Polchinski's continuous formulation of the renormalization group, developed over the last few years with T. Bodineau and B. Dagallier, as well as some applications to functional inequalities and sample path regularity of Euclidean field theories.
Time permitting, I will also…
I will discuss some of the present conceptual and theoretical (but not mathematical) understanding of the manybody localized (MBL) phase and its instabilities. In most cases, for the MBL phase to remain stable in the limit of an infinite system this limit needs to be taken differently from the standard thermodynamic limit (Gopalakrishnan…
I will discuss how symmetries of quantum spin systems can be realized. For a given realization of a symmetry group G of a 1d spin system, I will define the anomalous index that takes values in the cohomology H^4(BG) of the classifying space of the group. I will show that a Ginvariant system with a nontrivial anomalous index can not have a…
A nonuniform deformation of a honeycomb medium induces effectivemagnetic and effectiveelectric fields. One may choose a deformation which gives rise to a constant perpendicular effectivemagnetic field with Landaulevel spectrum (flat bands). In the setting of photonic crystals, the tight binding model is generally not applicable. I’ll…
The concept of "quasiperiodic" sets, functions, and measures is
prevalent in many fields including Mathematical Physics,
Fourier Analysis, and Number Theory. The Poisson summation formula provides a “Fourier characterization” for discrete periodic sets, saying that the Fourier transform of the counting measure of a discrete…
We consider a complex Ginibre ensemble of random matrices with a deformation $H=H_0+A$, where $H_0$ is a Gaussian complex Ginibre matrix and $A$ is a rather general deformation matrix. The analysis of such ensemble is motivated by many problems of random matrix theory and its applications. We use the Grassmann integration methods to obtain…
We consider various configuration exponents of Hamiltonian paths drawn on bipartite random planar maps. Estimates from exact enumerations are compared with predictions based on the KPZ relations, as applied to exponents on the regular hexagonal lattice. Surprisingly, a naive use of KPZ does not reproduce all the measured exponents, but an…
While the analysis of meanfield spin glass models has seen tremendous progress in the last twenty years, lattice spin glasses have remained largely intractable. I will talk about recent progress on this topic, giving the first proof of glassy behavior in the EdwardsAnderson model of lattice spin glasses.
We consider two models of random loops where we prove breaking of translational symmetry. The first is a mirror model, where the loops are formed by light rays bouncing in a labyrinth of randomly oriented mirrors. The second is a probabilistic representation of a quantum spin chain, and can be obtained as a limit of the first, for inhomogeneous…
Localization/delocalization transition in random Schrödinger operators cannot in general be seen from the behavior of the corresponding Integrated Density of States (IDS). Here we consider a random Schrödinger operator appearing in the study of certain reinforced random processes in connection with a supersymmetric sigmamodel, and show that…
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