Conductivities of magnetic quark-gluon plasma at strong coupling

TL;DR

This paper investigates how strong magnetic fields affect the electric conductivities of quark-gluon plasma using a holographic model, revealing linear magnetic field dependence and frequency-related enhancements.

Contribution

It generalizes the calculation of longitudinal and transverse conductivities at finite frequencies in a magnetized quark-gluon plasma, providing new insights into their magnetic and frequency dependence.

Findings

Longitudinal conductivity scales linearly with magnetic field.

Transverse conductivity is insensitive to magnetic field.

Conductivities increase significantly at high frequencies.

Abstract

In the presence of a strong magnetic field, the quark gluon plasma is magnetized, leading to anisotropic transport coefficients. In this work, we focus on the effect of magnetization on electric conductivity, ignoring the possible contribution from the axial anomaly. We generalize longitudinal and transverse conductivities to finite frequencies. For transverse conductivity, a separation of contribution from fluid velocity is needed. We study the dependence of the conductivities on the magnetic field and frequency using a holographic magnetic brane model. The longitudinal conductivity scales roughly linearly in the magnetic field, while the transverse conductivity is rather insensitive to the magnetic field. Furthermore, we find the conductivities can be significantly enhanced at large frequency. This can possibly extend the lifetime of the magnetic field, which is a key component of the chiral magnetic effect.