Properties of Confinement in Holography

TL;DR

This paper reviews confinement properties in holography, focusing on Wilson loop observables, temperature dependence of string tension, flux tube broadening, and k-string bound states, highlighting their universal features in confining theories.

Contribution

It provides a comprehensive review of holographic confinement features, emphasizing universal behaviors and relations among different confining observables.

Findings

String tension varies with temperature in the confining phase.

Flux tube broadening exhibits logarithmic growth in all confining theories.

k-string observables relate to single meson bound states.

Abstract

We review certain properties of confinement with added focus on the ones we study with holography. Then we discuss observables whose unique behavior can indicate the presence of confinement. Using mainly the Wilson loop in the gauge/gravity formalism, we study two main features of the QCD string: the string tension dependence on the temperature while in the confining phase, and the logarithmic broadening of the flux tube between the heavy static charges that turns out to be a generic property of all confining theories. Finally, we review the k-string bound state and we show that for a wide class of generic theories the k-string observables can be expressed in terms of the single meson bound state observables.