Casimir effect in critical $\mathrm{O}(N)$ models from non-equilibrium Monte Carlo simulations

Abstract

$\mathrm{O}(N)$ vector models in three dimensions, when defined in a geometry with a compact direction and tuned to criticality, exhibit long-range fluctuations which induce a Casimir effect. The strength of the resulting interaction is encoded in the excess free-energy density, which depends on a universal coefficient: the Casimir amplitude. We present a high-precision numerical calculation of the latter, by means of a novel non-equilibrium Monte Carlo algorithm, and compare our findings with results obtained from large-$N$ expansions and from the conformal bootstrap.

v1: 11 pages, 7 figures; v2: discussions in sec. 3 and 4 improved, matches published version

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