University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, December 10th 2018
12:30 pm:
FTPI Seminar in Tate 301-20
Speaker: Pavel Pylyavskyy, University of Minnesota, Dept. of Mathematics
Subject: Ising model and the positive orthogonal Grassmannian

Ising model is a classical model for ferromagnetism in statistical mechanics. In a joint work with Pavel Galashin we completely describe by inequalities the set of boundary correlation matrices of planar Ising networks embedded in a disk. Specifically, we give a simple bijection between such correlation matrices and points in the totally nonnegative part of the orthogonal Grassmannian, which has been introduced recently in the study of the scattering amplitudes of ABJM theory. Under our correspondence, Kramers--Wannier's high/low temperature duality transforms into the cyclic symmetry of the Grassmannian. We also show that the edge parameters of the Ising model for reduced networks can be uniquely recovered from boundary correlations, solving the inverse problem.

Faculty Host: Alex Kamenev

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.