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SUMMARY:How to get an interacting conformal line defect for free theories 
 - Dongsheng Ge (Osaka University)
DTSTART:20251013T090000Z
DTEND:20251013T103000Z
UID:TALK238822@talks.cam.ac.uk
DESCRIPTION:I will talk about a recent work with Chris Herzog and Sam Bart
 lett-Tisdall. In this work\, we argue that interacting conformal line defe
 cts in free quantum field theories can exist\, provided that inversion sym
 metry is broken. Important for our demonstration is the existence of a spe
 cial cross ratio for bulk-defect-defect three point functions that is inva
 riant under the conformal group but picks up a sign under inversion. We ex
 amine the particular case of a free scalar field in detail\, and provide a
  toy model example where this bulk field interacts via a Yukawa term with 
 fermions on the line. We expect nontrivial line defects may also exist for
  free Maxwell theory in four dimensions and free bulk fermions.\n&nbsp\;
LOCATION:Seminar Room 2\, Newton Institute
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