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| Description | Speaker: Vazha Loladze Title: Dynamics of the Fermion-Rotor System Room: 3024 Host: Markus Luty Abstract: 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 numbers of excitations that have previously passed through the origin to ensure scattering consistent with all symmetries, thereby resolving the long-standing Unitarity puzzle. I will then discuss generalizations of this setup with multiple rotors and unequal charges, and demonstrate how the system can be viewed as a UV-completion of boundary states for chiral theories, establishing a connection to the resolution of the puzzle using boundary conformal field theory. |
| Date | Mon, December 1, 2025 |
| Time | 1:30pm-3:00pm PST |
| Duration | 1 hour 30 minutes |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Tue, November 25, 2025 4:32pm PST |
