Την Τετάρτη 26 Φεβρουαρίου στις 17:00 (παρακαλώ προσέξτε την ασυνήθιστη ώρα) ο Fedor K. Popov (University of Stony Brook) θα δώσει ένα διαδικτυακό σεμινάριο.

Η μετάδοση θα γίνει μέσω Zoom:
https://authgr.zoom.us/j/99295777737?pwd=xox5j9ZnXm3enVf7TCKNhIWVZDaTY2.1

Meeting ID: 992 9577 7737
Passcode: 492754

Ακολουθούν ο τίτλος και η περίληψη της ομιλίας:

Title: Temperature-Resistent Order in 2+1 dimensions

Abstract: High temperatures are typically thought to increase disorder. Here we examine this idea in Quantum Field Theory in 2+1 dimensions. For this sake we explore a novel class of tractable models, consisting of nearly-mean-field scalars interacting with critical scalars. We identify UV-complete, local, unitary models in this class and show that symmetry breaking Z2​→∅ occurs at any temperature in some regions of the phase diagram. This phenomenon, previously observed in models with fractional dimensions, or in the strict planar limits, or with non-local interactions, is now exhibited in a local, unitary 2+1 dimensional model with a finite number of fields.