REMINDER - High Energy Physics Seminar TOMORROW - Loladze - venue: Euler LH

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_*
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*Thursday, 23 April *2026, at *16:00* - *_Euler Lecture 
Hall_***-*https://indico.ictp.it/event/11302/*

Vazha Loladze (University of Oxford)


*“Dynamics of the Fermion-Rotor System"*
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_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 boundary conformal field theory based proposal for 
resolving the puzzle.

To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/k_jOSKXvTQKq0SGVCmf1iQ