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SUMMARY:Walking\, Weakly First-Order Phase Transitions\, and Complex CFTs 
 - Slava Rychkov (IHES\; École Normale Supérieure)
DTSTART:20181023T103000Z
DTEND:20181023T113000Z
UID:TALK113086@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Teaser: Most people have heard that the 2d Potts model with Q=
 5 states has a first order phase transition\, but not everyone knows that 
 the correlation length at this phase transition is 2500 lattice spacings. 
   This is going to be a nonrigorous physics talk.  We will give an introdu
 ction to "walking RG" behavior in gauge theories and connect it to Type II
  weak first-order phase transitions in statistical physics. Despite appear
 ing in very different systems (QCD below the conformal window\, the Potts 
 model\, deconfined criticality) these two phenomena both imply approximate
  scale invariance in a range of energies and have the same RG interpretati
 on: a flow passing between pairs of fixed point at complex coupling\, dubb
 ed "complex CFTs". Observables of the real walking theory are approximatel
 y computable by perturbing the complex CFTs. The general mechanism will be
  illustrated by a specific and computable example: the two-dimensional Q-s
 tate Potts model with Q > 4.  Based on http://arxiv.org/abs/1807.11512 and
  http://arxiv.org/abs/1808.04380
LOCATION:Seminar Room 1\, Newton Institute
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