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SUMMARY:The Fermion-Rotor Model - David Tong (University of Cambridge)
DTSTART:20250929T090000Z
DTEND:20250929T103000Z
UID:TALK236788@talks.cam.ac.uk
DESCRIPTION:Many years ago\, Joe Polchinski wrote down a simple impurity m
 odel describing chiral fermions in d=2 dimensions interacting with a local
 ised rotor degree of freedom at the origin. The model is deceptive in its 
 simplicity. A quantum anomaly means that ingoing fermions carry different 
 quantum numbers from outgoing fermions and naively it appears that no cons
 istent scattering is possible. This mimics a problem that occurs when ferm
 ions in the Standard Model scatter off monopoles. Joe was unable to solve 
 his model but recently others made progress. I&rsquo\;ll explain the model
 \, its solution\, and its relation to boundary states and twist operators.
 \n&nbsp\;
LOCATION:Seminar Room 2\, Newton Institute
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