Drag force on heavy quarks from holographic QCD * * Supported by Guizhou Provincial Key Laboratory Of Computational Nano-Material Science (2018LCNS002)

Yuanhui Xiong,Zhongjie Luo,Xingzheng Tang

doi:10.1088/1674-1137/43/11/113103

Abstract

We study the drag force of a relativistic heavy quark using a holographic QCD model with conformal invariance broken by a background dilaton. The effects of the chemical potential and the confining scale on this quantity are analyzed. The drag force in this model is shown to be larger than that of supersymmetric Yang-Mills (SYM) plasma. In particular, the inclusion of the chemical potential and confining scale both enhance the drag force, in agreement with earlier findings. Moreover, we discuss how the chemical potential and confining scale influence the diffusion coefficient.

Highlights

The ultra-relativistic heavy-ion experimental programs at the Relativistic Heavy Ion Collider (RHIC) and the LargeHadron Collider (LHC) have created a new type of matter so-called quark gluon plasma (QGP) [1,2,3]
This phenomenon could be studied from the drag force: heavy quarks move through the QGP, they feel a drag force and lose energy
Here we consider the drag force in this model and understand the possible physical implications of our results in this dual plasma. Another motivation for this paper is that previous works either discuss the drag force in some strongly coupled thermal gauge theories with chemical potential [18,19,20] or holographic QCD without chemical potential [23,24,25]

Summary

INTRODUCTION

The ultra-relativistic heavy-ion experimental programs at the Relativistic Heavy Ion Collider (RHIC) and the Large. Where v, T , λ are the quark velocity, the plasma temperature and ’t Hooft coupling, respectively This idea has been generalized to various cases, such as chemical potential [18,19,20], finite coupling [21], non-commutativity plasma [22] and AdS/QCD models [23,24,25]. Here we consider the drag force in this model and understand the possible physical implications of our results in this dual plasma Another motivation for this paper is that previous works either discuss the drag force in some strongly coupled thermal gauge theories (not holographic QCD) with chemical potential [18,19,20] or holographic QCD without chemical potential [23,24,25]. It should be noticed that metric (13) and metric (14) are equivalent but with different coordinate systems

DRAG FORCE

DIFFUSION COEFFICIENT

CONCLUSION