Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamics of nonintegrable systems from a relaxation-time
  approximation   We develop a general kinetic theory framework to describe the hydrodynamics
of strongly interacting, nonequilibrium quantum systems in which integrability
is weakly broken, leaving a few residual conserved quantities. This framework
is based on a generalized relaxation-time approximation; it gives a simple, but
surprisingly accurate, prescription for computing nonequilibrium transport even
in strongly interacting systems. This approximation reproduces the crossover
from generalized to conventional hydrodynamics in interacting one-dimensional
Bose gases with integrability-breaking perturbations, both with and without
momentum conservation. It also predicts the hydrodynamics of chaotic quantum
spin chains, in good agreement with matrix product operator calculations.

18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys