---------- Forwarded message --------- Da: Andreas Kyprianou <ak257@bath.ac.uk> Date: mer 10 giu 2020 alle ore 08:57 Subject: [owps] One World Probability Seminar Thursday 11th June 2020 To: <owps@lists.bath.ac.uk> One World Probability Seminar Thursday 11th June 2020: Tomorrow we will have a double talk on "A new point of view on topological phase transitions“. The first talk will be more introductory and accessible for a large audience. ------------------------------------------------------------ 15.00 CEST: Christophe Garban (Lyon) 16.00 CEST: Avelio Sepúlveda (Lyon) Abstract: Topological phase transitions were discovered by Berezinskii-Kosterlitz- Thouless in the 70's. They describe intriguing phase transitions for classical spins systems such as the plane rotator model (or XY model). Part 1 : General introduction on the topological phase transitions. Without assuming any a priori background, we will discuss how this phase transition arises in cases such as : - the XY model (spins on Z^2 with values in the unit circle) - the integer-valued Gaussian Free Field - Abelian Yang-Mills on Z^4 We will also discuss some of the main contributions of Fröhlich and Spencer to this theory. Part 2 : A statistical reconstruction problem. We will connect topological phase transitions to a statistical reconstruction problem concerning the Gaussian Free Field and will show that the feasibility of the reconstruction undergoes a KT transition. The talks will be based mostly on the preprint: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Farxiv.org%... ------------------------------------------------------------ Please keep in mind that we are working with Central European summer time. As always, the Zoom-room link will appear on the OWPS seminar webpage: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.owproba... But you can also link to it directly by clicking this link tomorrow: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fus02web.zo... Meeting-ID: 876 7251 4177 Please feel free to circulate this email. We hope to see you all tomorrow! One World Probability Team -- ************************************************* Prof. Alessandra Faggionato http://www1.mat.uniroma1.it/~faggionato/ Department of Mathematics University "La Sapienza" Piazzale Aldo Moro, 5 00185 - Rome Office 5, Phone (0039) 06 49913252 *************************************************