Progress report: Sabine Harribey

Wednesday 5 Jun 2024, 11:15 → 12:30 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Title: Defects and Boundaries in the O(N) model

Abstract:
Introducing defects for O(N) critical models has recently sparked much interest. Indeed, from a theoretical point of view defects give rise to new universality classes of 3D CFTs that can often be studied analytically. Defects can also describe physical impurities or finite-size effects that can be realised experimentally. 

In this talk, I will first review line defects and surface defects in the O(N) model. I will then present another approach through interfaces with localised cubic interactions perturbing a quartic multi-scalar model. We computed the one-loop beta functions and then looked for fixed points both analytically and numerically for different bulk symmetries.