Positive magnetoresistance induced by hydrodynamic fluctuations in chiral media

TL;DR

This paper investigates how hydrodynamic fluctuations influence magnetoresistance in chiral media, revealing that fluctuations induce a positive magnetoresistance related to the chiral magnetic effect, contrasting earlier negative findings.

Contribution

It introduces a non-equilibrium effective field theory to show fluctuations cause a positive CME-related magnetoresistance, expanding understanding of chiral media behavior.

Findings

Fluctuations lead to positive magnetoresistance in chiral media.

At zero axial relaxation, fluctuations affect both transverse and longitudinal conductivities.

Contrasts previous studies that found negative magnetoresistance without fluctuations.

Abstract

We analyze the combined effects of hydrodynamic fluctuations and chiral magnetic effect (CME) for a chiral medium in the presence of a background magnetic field. Based on the recently developed non-equilibrium effective field theory, we show fluctuations give rise to a CME-related positive contribution to magnetoresistance, while the early studies without accounting for the fluctuations find a CME-related negative magnetoresistance. At zero axial relaxation rate, the fluctuations contribute to the transverse conductivity in addition to the longitudinal one.