Symmetry and Topology in Particle Physics

Liste des Contributions

1. Electron-Monopole Scattering from Conformal Field Theory

Clay Córdova (University of Chicago)

09/03/2026 09:30

S-wave scattering of electrons off of heavy magnetic monopoles is an important problem both in formal theory and in particle phenomenology. It has long been understood that this scattering can be effectively studied in two-dimensional conformal field theory with a recently appreciated crucial role played by topological line defects and generalized global symmetry. We use the formalism of...

2. Discussion: "Monopoles, Strings, etc."

Daniel Brennan (University of Birmingham), Sungwoo Hong (KAIST)

09/03/2026 11:00

3. Free discussion

09/03/2026 14:00

4. Abelian Instantons in Quantum Field Theory and Gravity

Isabel García García (University of Washington)

09/03/2026 15:30

7. Dynamics of the Fermion-Rotor System

Vazha Loladze (University of Oxford)

10/03/2026 09:30

In this talk, I will examine the dynamics of the fermion–rotor system, originally introduced by Polchinski as a toy model for monopole–fermion scattering. Despite its simplicity, the system is surprisingly subtle, with ingoing and outgoing fermion fields carrying different quantum numbers. I will show that the rotor acts as a twist operator in the low-energy theory, changing the quantum...

6. Discussion "Generalized Symmetries: Useful for Model Building?"

Nathaniel Craig (UC Santa Barbara), Ben Gripaios (Cambridge University)

10/03/2026 11:00

5. 2d Dualities and Mass Hierarchies

Raffaele Tito D'Agnolo (IPhT, CEA Saclay/ENS)

10/03/2026 14:00

I will explore the Kramers-Wannier duality in the continuum and comment on its implications for the electroweak hierarchy problem.

8. Free discussion

10/03/2026 15:30

9. QCD Wilson Lines in IR Chiral Lagrangian (Remote)

Ho Tat Lam (Stanford University)

10/03/2026 16:30

In this talk, we will answer the question: What does a QCD Wilson line flow to in the IR chiral Lagrangian? We will first present a symmetry-based argument showing that the Wilson line is not completely screened in the IR. We then propose a disorder operator realization of the Wilson line in the chiral Lagrangian. This allows us to model heavy-light mesons and baryons and describe the...

10. Spurion Analysis for a Class of Selection Rules Without Group Actions

Ling-Xiao Xu (ICTP)

11/03/2026 09:30

Recent advances have uncovered a new class of selection rules in particle physics models arising from non-invertible fusion algebras. We refer to these as non-invertible selection rules (NISRs), distinguishing them from conventional selection rules derived from ordinary group laws. In this talk, we illustrate their implications in perturbation theory using spurion analysis, and connect to...

15. Discussion: "The S-Matrix, Generalized"

Lucia Córdova (University of Amsterdam), Diego García-Sepúlveda (Harvard University)

11/03/2026 11:00

12. Free discussion

11/03/2026 14:00

13. Student talks

Finn Gagliano (Durham University), Jonah Berean-Dutcher (UBC & IHES), Marius Kongsore (NYU)

11/03/2026 15:30

14. Berry Phase on Boundary Conformal Manifolds

Yichul Choi (Institute for Advanced Study)

12/03/2026 09:30

Conformal boundary conditions appear in various different contexts, in the study of impurities, scattering of massless particles off a heavy monopole, D-branes, and so on. I will discuss a new “higher” geometric structure the space of conformal boundary conditions possesses in 1+1d conformal field theories.

11. Discussion: "The Global SM & Beyond"

Po-Shen Hsin (King's College London), Seth Koren (University of Notre Dame)

12/03/2026 11:00

16. Testing Stringy and Field Theory GUTs With Axions

Mario Reig (CERN)

12/03/2026 14:00

The topological nature of axion couplings to gauge bosons offers unique opportunities to obtain information about the UV limit of the SM. The coupling to photons is particularly important experimentally. I will discuss why the discovery of an axion-like particle above the QCD line would rule out grand unified theories, the perturbative heterotic string, and F-theory GUTs. Based on 2206.07053,...

17. Free discussion

12/03/2026 15:30