Chiral transport in curved spacetime via holography

TL;DR

This paper uses holography to analyze how gravitational anomalies influence chiral transport phenomena like the CME and CVE in strongly interacting plasmas, revealing gradient corrections and gravitational responses.

Contribution

It introduces a holographic model that captures gravitational anomaly effects on chiral transport up to third-order gradients, including novel gravitational responses.

Findings

Reproduces chiral magnetic and vortical effects

Identifies gradient corrections due to gravitational anomaly

Discovers energy-momentum response linked to quantum anomalies

Abstract

We consider a holographic model of strongly interacting plasma with a gravitational anomaly. In this model, we compute parity-odd responses of the system at finite temperature and chemical potential to external electromagnetic and gravitational fields. Working within the linearized fluid/gravity duality, we performed the calculation up to the third order in gradient expansion. Besides reproducing the chiral magnetic(CME) and vortical (CVE) effects we also obtain gradient corrections to the CME and CVE due to the gravitational anomaly. Additionally, we find energy-momentum and current responses to the gravitational field similarly determined by the gravitational anomaly. The energy-momentum response is the first purely gravitational transport effect that has been related to quantum anomalies in holographic theories.