Spatial Wilson Loops and Energy Loss for Heavy Quarks in Magnetized HQCD Model

TL;DR

This paper explores how external magnetic fields and spatial anisotropy affect the spatial Wilson loop and energy loss of heavy quarks in a holographic QGP model, revealing magnetic catalysis and anisotropy-dependent behaviors.

Contribution

It introduces a holographic approach to study the effects of magnetic fields and anisotropy on Wilson loops and string tension in hot dense QGP, highlighting phase transition behaviors.

Findings

Magnetic catalysis influences phase transition between string configurations.

External magnetic field and anisotropy increase string tension and drag force.

String tension scales as T^2 in isotropic case, deviating in anisotropic case.

Abstract

We investigate the effective potential and the string tension for the spatial Wilson loop (SWL) in hot dense QGP with two types of anisotropy, i.e. external magnetic field and spatial anisotropy, employing a holographic approach for the heavy quark model. In this approach, the string is extended in the 5th, holographic direction and has a turning point either on a dynamical wall (DW) configuration or on the horizon configuration in the 5th direction. We obtain the magnetic catalysis behavior for a phase transition between DW and horizon configuration of the string. The structure of the phase diagram does not depend on the boundary conditions choice for the dilaton field. Inclusion of the external magnetic field and spatial anisotropy enhance the string tension in the horizon configuration, namely drag force. For the spatially isotropic case $\nu = 1$ at different magnetic field values the string tension is proportional to $T^2$ and is qualitatively consistent with lattice results. However, for the anisotropic case, $\nu = 4.5$, it deviates from the quadratic term.