Dear colleagues, We are glad to announce the following *hybrid* - that is, in person with online streaming - *talk*: SPEAKER: *Quentin Berger *(Sorbonne Université) TITLE: *Some results about the Ising model on a Galton-Watson tree* TIME: *Monday 18 March*, *10:30-11:30* (Rome time zone), PLACE: building *U5*/*RATIO,* room *3014* - Dept. of Mathematics, Università di *Milano-Bicocca* *ABSTRACT*: The goal of my talk is to present some results on the Ising model on a Galton-Watson tree. I will start with a general introduction, recalling in particular the seminal results of Russell Lyons. I will then present the results obtained in collaboration with Irene Ayuso Ventura (University Paris-Est Créteil), which estimate the effect of a sparse external field or boundary condition on the magnetisation of the root. *Webex meeting link:* https://unimib.webex.com/unimib-it/j.php?MTID=m17566503818a9f0252857ab86a9cf... *ID meeting:* 2744 704 8632 *Password:* KCmM2g4wms6 - This talk is part of the *(PMS)^2: Pavia-Milano Seminar series on Probability and Mathematical Statistics* organized jointly by the universities Milano-Bicocca, Pavia, Milano-Politecnico. Participation is free and welcome! Best regards, The organizers (Carlo Orrieri, Maurizia Rossi, Margherita Zanella) -- Maurizia Rossi Dipartimento di Matematica e Applicazioni Università degli Studi di Milano-Bicocca https://mauriziarossi.wordpress.com