Drag force on heavy quarks from holographic QCD

TL;DR

This paper investigates how a holographic QCD model with broken conformal invariance affects the drag force on heavy quarks, revealing enhancements due to chemical potential and confining scale compared to standard SYM plasma.

Contribution

It introduces a holographic QCD framework incorporating dilaton effects to analyze heavy quark drag force, extending previous models by including chemical potential and confinement influences.

Findings

Drag force exceeds that in $ ext{N}=4$ SYM plasma.

Chemical potential increases drag force.

Confining scale enhances drag force.

Abstract

We study the drag force of a relativistic heavy quark using a holographic QCD model with conformal invariance broken by a background dilaton. We analyze the effects of chemical potential and confining scale on this quantity, respectively. It is shown that the drag force in this model is larger than that of $\mathcal{N}=4$ 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. Also, we discuss how chemical potential and confining scale influence the diffusion coefficient.