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MATHEMATICAL PHYSICS WEBINAR
RUTGERS UNIVERSITY

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Slava Rychkov - IHES, Bures-sur-Yvette

Wednesday, July 9th, 2025

Zoom opens: 10:30AM DST

Seminar Begins: 10:45AM DST

Renormalization group computations with rigorous error bars at finite couplings.

Renormalization group (RG) is an appealing framework to analyze phases of lattice models. Many theorems were proved using this technique, but most of them apply below some unspecified small coupling epsilon.  How can we compute if couplings are finite? Without truncation infinitely many couplings may be generated, how shall we control the error? In this talk I will present a robust method based on tensor network RG. The method uses tensor networks but it gives results about classical lattice 2D models such as Ising or XY or their perturbations.

Based on arXiv:2506.03247 with Nikolay Ebel and Tom Kennedy.