Anomaly induced transport from symmetry breaking in holography

TL;DR

This paper investigates how quantum anomalies influence transport properties in relativistic fluids with explicit symmetry breaking using holographic models, revealing that anomalies affect both anomalous and non-anomalous sectors.

Contribution

It introduces a holographic Einstein-Maxwell model with Chern-Simons terms and a scalar field to analyze anomaly-induced transport under explicit symmetry breaking, extending understanding of anomaly effects.

Findings

Conductivities are sensitive to the symmetry breaking mass parameter.

Anomaly-induced effects influence both anomalous and non-anomalous transport sectors.

Explicit symmetry breaking modifies the interplay between anomalies and transport properties.

Abstract

We study the transport properties of relativistic fluids induced by quantum anomalies in presence of explicit symmetry breaking. To this end we consider a holographic Einstein-Maxwell model in 5 dimensions with pure gauge and a mixed gauge-gravitational Chern-Simons terms, coupled with a scalar field. To study the chiral vortical effects and the energy transport sector, apart from the chiral magnetic effects, we have considered the full backreaction of the gauge field on the metric. We have studied the anomalous effects by using Kubo formulae involving correlators of the charged currents and the energy current. Our findings reveal that, in the presence of explicit symmetry breaking, anomaly-induced transport phenomena can extend beyond anomalous currents and affect non-anomalous sectors as well. In particular, we find that all the conductivities display a distinct sensitivity to the mass parameter controlling the symmetry breaking, thus reflecting the interplay between anomaly coefficients and explicit symmetry breaking terms. These findings highlight the role played by pure gauge and mixed gauge-gravitational anomalies in holographic transport, and their importance for strongly coupled systems with broken symmetries.