Holographic chiral shear waves from anomaly

TL;DR

This paper investigates how chiral shear waves in strongly coupled N=4 SYM plasma are affected by anomalies, revealing parity-odd contributions to dispersion relations due to holographic Chern-Simons terms.

Contribution

It provides the first systematic derivation of chiral shear wave dispersion relations incorporating anomaly effects via holography.

Findings

Helicity +1 and -1 shear modes acquire parity-odd contributions.

Dispersion relations depend on the sign of helicity, indicating chiral behavior.

Results demonstrate anomaly-induced modifications in hydrodynamic wave propagation.

Abstract

We study dispersion relations of hydrodynamic waves of hot N=4 SYM plasma at strong coupling with a finite U(1) R-charge chemical potential via holography. We first provide complete equations of motion of linearized fluctuations out of a charged AdS black-hole background according to their helicity, and observe that helicity +1 and -1 transverse shear modes receive a new parity-odd contribution from the 5D Chern-Simons term, which is dual to 4D U(1)^3 anomaly. We present a systematic solution of the helicity +1,-1 wave equations in long wave-length expansion, and obtain the corresponding dispersion relations. The results depend on the sign of helicity, which may be called chiral shear waves.