Hot Defect Superconformal Field Theory in an External Magnetic Field

TL;DR

This paper explores how an external magnetic field affects a holographic gauge theory with flavor, revealing phase transition modifications, thermodynamic behavior, and meson spectrum characteristics in a finite temperature setting.

Contribution

It provides a detailed analysis of magnetic field effects on phase transitions, thermodynamics, and meson spectra in a holographic gauge theory with flavor at finite temperature.

Findings

Magnetic field freezes the confinement/deconfinement transition.

Enhanced entropy jump at the chiral phase transition.

Both phases exhibit diamagnetic response with temperature-dependent magnetization.

Abstract

In this paper we investigate the influence of an external magnetic field on a flavoured holographic gauge theory dual to the D3/D5 intersection at finite temperature. Our study shows that the external magnetic field has a freezing effect on the confinement/ deconfinement phase transition. We construct the corresponding phase diagram. We investigate some thermodynamic quantities of the theory. A study of the entropy reveals enhanced relative jump of the entropy at the "chiral" phase transition. A study of the magnetization shows that both the confined and deconfined phases exhibit diamagnetic response. The diamagnetic response in the deconfined phase has a stronger temperature dependence reflecting the temperature dependence of the conductivity. We study the meson spectrum of the theory and analyze the stability of the different phases looking at both normal and quasi-normal semi-classical excitations. For the symmetry breaking phase we analyze the corresponding pseudo-Goldstone modes and prove that they satisfy non-relativistic dispersion relation.