Ising string beyond Nambu-Goto

Abstract

A major result of the Effective String Theory (EST) description of confinement is the so called "low energy universality," which states that the first few terms of the large distance expansion of any EST are universal and coincide with those of the Nambu-Goto action. Going beyond this approximation is one of the most interesting open problems in the EST. In the higher order terms beyond Nambu-Goto several important pieces of physical information are encoded, which could improve our understanding of the physical mechanisms behind confinement and of the physical degrees of freedoms which originate the EST. In this paper we evaluate numerically the first two of these corrections in the case of the three dimensional gauge Ising model. The first of them turns out to be negative: ${\gamma }_3=-0.00048(4)$, similar (but not equal) to the one recently measured in the $SU(2)$ Yang Mills theory in three dimensions and compatible with the bootstrap bound ${\gamma }_3\ge -\frac{1}{768}$.

arXiv comment27 pages, 1 figure

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Cited by in corpus (3)

• Numerical determination of the width and shape of the effective string using Stochastic Normalizing Flows
• Confining strings in three-dimensional gauge theories beyond the Nambu--Gotō approximation
• The finite temperature ground state energy of the confining string in three-dimensional U(1) gauge theory