Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origins and diagnostics of the nonequilibrium character of active
  systems   We present in detail a Langevin formalism for constructing stochastic
dynamical equations for active-matter systems coupled to a thermal bath. We
apply the formalism to clarify issues of principle regarding the sources and
signatures of nonequilibrium behaviour in a variety of polar and apolar
single-particle systems and polar flocks. We show that distance from thermal
equilibrium depends on how time-reversal is implemented and hence on the
reference equilibrium state. We predict characteristic forms for the
frequency-resolved entropy production for an active polar particle in a
harmonic potential, which should be testable in experiments.

14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat