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DTSTAMP:20260404T015832Z
UID:1633003200@ist.ac.at
DTSTART:20210930T140000
DTEND:20210930T145000
DESCRIPTION:Speaker: Marcin Lis\nhosted by M. Beiglböck\, N. Berestycki\, 
 L. Erdös\, J. Maas\, F. Toninelli\nAbstract: We present a new proof of th
 e BKT phase transition in the spin XY (planar rotor) model on any planar l
 attice — a result first established by Fröhlich and Spencer in 1981. Ou
 r approach is quite elementary. It does not go through the analysis of vor
 tices but rather through the dual integer-valued height function. We use a
  recent result of Lammers on delcoalization of general height functions to
 gether with a new loop representation of spin correlations in the XY model
 \, that we believe to be of independent interest. This is joint work with 
 Diederik van Engelenburg. 
LOCATION:Rényi Institute Budapest\, ISTA
ORGANIZER:birgit.oosthuizen-noczil@ist.ac.at
SUMMARY:Marcin Lis: A new approach to the Berezinskii–Kosterlitz–Thoule
 ss transition in the planar XY model 
URL:https://talks-calendar.ista.ac.at/events/3297
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