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8/31/26, 9:00 AM
Brownian motion and geodesic dynamics on hyperbolic surfaces are connected in many classical ways. Harmonic measure on the ideal boundary, for instance, can be described either through the asymptotic behavior of Brownian motion or through the endpoint of a geodesic ray with uniformly chosen initial direction. Similarly, recurrence of Brownian motion is intimately tied to the ergodicity of the...
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8/31/26, 10:15 AM
Most perturbative series in quantum theory are factorially divergent. In the 1970s-1980s, many physicists, starting with the work of Bender and Wu, understood that these divergences are closely related to non-perturbative sectors, and in particular to instantons. In this talk I will first review these results, and then show how they can be applied in a very different context, suggesting new...
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8/31/26, 11:15 AM
How does collective order emerge from the microscopic laws governing interacting quantum particles? This question lies at the heart of mathematical physics and drives much of its contemporary research. In this talk, I will focus on effective evolution equations emerging in the mean-field approximation and present a functional-analytic method to study their semiclassical regime. Its broad...
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8/31/26, 4:10 PM
Higher-form symmetries often provide a complementary perspective on familiar results in gauge theory. After a brief review, I will discuss the consequences of their spontaneous breaking, using AdS as a concrete setting. I will then present applications inspired by Maxwell theory, culminating in a theorem that, to our knowledge, has no counterpart from ordinary (0-form) symmetries.
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8/31/26, 4:35 PM
Understanding the dynamics of systems far from equilibrium is one of the central challenges of modern theoretical physics. Questions of thermalization, transport, information spreading, and entanglement growth are notoriously difficult to address analytically, making exactly solvable time-dependent models particularly valuable.
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In this talk, I will present a framework for extending... -
8/31/26, 5:00 PM
In this talk, I will present a semiclassical framework for computing correlation functions of nonlocal, gauge-invariant dressed operators in gauge theories. As a case study, I will consider the critical Abelian Higgs model and discuss two key observables: the Dirac-dressed propagator, which provides a nonlocal order parameter for superconductivity, and the cusp anomalous dimension, which...
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8/31/26, 5:25 PM
Matrix quantum mechanics, most prominently the BFSS and BMN models, provides a powerful framework to study holographic phenomena such as fast scrambling, quantum chaos and emergent gravity. Yet, the strong-coupling regime remains difficult to access. This talk presents a genuinely different approach to extracting holographic information from these models based on quantum simulation. The idea...
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8/31/26, 5:50 PM
Identifying which boundary conditions preserve integrability in two-dimensional sigma-models is a basic structural question, relevant from open string dynamics to impurity problems. I will discuss a simple approach that determines integrable boundary conditions through the divisor structure of the Lax connection, giving a generalisation of previous constructions. As an application, I will...
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8/31/26, 6:15 PM
We derive integrable deformations of the 2d Breitenlohner-Maison (BM) sigma model that describes the stationary, axisymmetric sector of 4d general relativity, as well as higher-rank generalisations thereof, using the framework of 4d Chern-Simons theory. In particular, we consider deformations of the boundary conditions and action of the 4d Cole-Weck model, which lead to deformations of the BM...
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13. Short talk: Nikolay Borozenets (UNIGE) - Harmonic effects in compressed two-dimensional crystals8/31/26, 6:40 PM
Two-dimensional crystal membranes (most notably graphene) are subject to external strain imposed by the environment in which they are placed. Under external tension, the membranes are expected to be in a harmonic regime, that is, to exhibit logarithmic behavior of fluctuations. The behavior of fluctuations of compressed membranes is considerably more subtle, as their equilibrium states no...
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9/1/26, 9:00 AM
I will review physical properties of systems that have unusual non-local symmetries called Quantum Groups. I will focus on the case when the symmetry is fully internal, meaning that it commutes with the Hamiltonian, as well as with Lorentz transformations when they are present. We will find that in the continuum Quantum Group generically transforms local fields or operators into non-local...
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9/1/26, 10:15 AM
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9/1/26, 11:15 AM
I will discuss a model for fermions on a two-dimensional square lattice, minimally coupled to a Z2-valued dynamical gauge field, living on the bonds of the lattice. As observed numerically, this system displays a rich phase diagram, depending on the model parameters. In particular, at half-filling, the model at low temperature exhibits a semimetallic phase, in which the low-energy charge...
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9/1/26, 6:00 PM
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9/2/26, 9:00 AM
Usual scenarios of fault-tolerant computation are concerned with the fault-tolerant realization of quantum algorithms that compute classical functions, such as Shor's algorithm for factoring. In particular, this means that input and output to the quantum algorithm are classical. In contrast to stand-alone single-core quantum computers, in many distributed scenarios, quantum information might...
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9/2/26, 10:15 AM
Quantum Field Theory (QFT) on hyperbolic space can be characterized by a set of numbers that we call QFT data. For simplicity, we focus on two dimensional QFTs and derive a universal set of first order Ordinary Differential Equations (ODEs) that encode the variation of the QFT data under an infinitesimal change of a bulk relevant coupling. In principle, our ODEs can be used to follow a...
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9/2/26, 11:15 AM
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