Buongiorno ricevo e con piacere inoltro Saluti Alessandra

---------- Forwarded message --------- From: Serena Cenatiempo serena.cenatiempo@gssi.it Date: Mon, 8 May 2023 at 08:00 Subject: SMAQ Seminar / J. Björnberg / today at 2.30 pm

Dear all,

This is a gentle reminder for today SMAQ seminar by

Jakob Björnberg http://www.math.chalmers.se/~jakobbj/ (Chalmers and Göteborg University)

on "*Dimerization in a quantum spin chain*", see abstract below.

The talk will be at 14.30 at the GSSI Auditorium (Viale Jacobucci 2) and will be streamed via zoom at the link:

https://zoom.us/j/87571297606?pwd=bGY1ZGxpd2Y0THBEdG53Zmt3MVZ1UT09

ID riunione: 875 7129 7606 Passcode: SMAQ2223

We are looking forward to meeting you today, Alessia and Serena

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*Date:* May 8th, 2023 *Hour:* 2.30 pm *Room:* GSSI Auditorium and online *Speaker:* Jakob Björnberg (Chalmers and Göteborg University)

*Title: Dimerization in a quantum spin chain*

*Abstract: *This talk concerns the phenomenon of symmetry-breaking in statistical physics, particularly "dimerization" where the broken symmetry is that of translation-invariance. After reviewing the main ideas of symmetry-breaking in statistical physics, I will describe a quantum spin system in one dimension where we prove that dimerization occurs for large enough spin. The proof uses a probabilistic representation in terms of a collection of random loops and a cluster-expansion. Based on the paper arXiv:2101.11464 which is joint work with Peter Mühlbacher, Bruno Nachtergaele and Daniel Ueltschi.

-------------------------------------------------- Serena Cenatiempo Gran Sasso Science Institute (GSSI) Viale Crispi n.7, 67100 - L'Aquila (Italy)

phone: +39 0862 428 0276 email: serena.cenatiempo[at]gssi[dot]com homepage: http://www.serenacenatiempo.it/