Casimir effect in critical O(N) models from non-equilibrium Monte Carlo simulations

Tuesday 1 Jul 2025, 15:15 → 16:15 Europe/Berlin

Nußallee 14-16/0.023 (HISKP) - Lecture Hall (HISKP)

Andrea Bulgarelli (University of Turin)

Lattice systems, when tuned to criticality, exhibit long-range fluctuations that are sensitive to the geometry in which they are confined. The critical Casimir amplitude encodes universal information on this behavior. Predicting this quantity in models with O(N) symmetry would have applications from liquids, to magnets, to high-energy physics, but so far different calculations have yielded conflicting results. Using a new numerical technique, we push the theoretical predictions to a range of parameters never studied before, revealing a non-trivial dependence on the number of spin components, N, and comparing our results to bootstrap calculations.