Navier-Stokes equations for nearly integrable quantum gases

TL;DR

This paper derives Navier-Stokes equations from the microscopic dynamics of nearly integrable 1D quantum gases, revealing two viscous regimes and computing transport coefficients relevant for cold-atomic gases.

Contribution

It introduces a method to derive Navier-Stokes equations from nearly integrable quantum systems, extending hydrodynamics to non-integrable interactions.

Findings

Two distinct viscous regimes identified in the Navier-Stokes equations.

Transport coefficients computed for coupled 1D cold-atomic gases.

Method applicable to experimental quantum gas systems.

Abstract

The Navier-Stokes equations are paradigmatic equations describing hydrodynamics of an interacting system with microscopic interactions encoded in transport coefficients. In this work we show how the Navier-Stokes equations arise from the microscopic dynamics of nearly integrable $1d$ quantum many-body systems. We build upon the recently developed hydrodynamics of integrable models to study the effective Boltzmann equation with collision integral taking into account the non-integrable interactions. We compute the transport coefficients and find that the resulting Navier-Stokes equations have two regimes, which differ in the viscous properties of the fluid. We illustrate the method by computing the transport coefficients for an experimentally relevant case of coupled $1d$ cold-atomic gases.