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SUMMARY:Magnetic defects and new RG monotones - Matthew M Roberts (Univers
 ity of Iceland)
DTSTART:20251031T100000Z
DTEND:20251031T110000Z
UID:TALK237010@talks.cam.ac.uk
DESCRIPTION:We study conformal magnetic defects corresponding to an infini
 tely long and thin magnetic solenoid in the context of supersymmetric quan
 tum field theory. In four dimensions this co-dimension two defect has one 
 new A-type trace anomaly coefficient $b$\, which is monotonic under defect
  RG flows and depends nontrivially on the magnetic flux. We study these de
 fects in a UV and IR fixed point of a bulk RG flow and demonstrate that $b
 $ is no longer monotonic\, and can both increase or decrease. However\, we
  find a particular combination of anomaly coefficients\, $12a-b$\, is mono
 tonic\, and conjecture that this is true for general 4d/2d defects. We als
 o study the 3d/1d system\, which has no trace anomaly\, though we can stil
 l define a ``defect free energy''\, which also appears to be monotonic.
LOCATION:Seminar Room 1\, Newton Institute
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