Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The microscopic phase density functional approach to the construction of
  the kinetic and hydrodynamic description for the system of self-propelled
  particles   We use the method of the microscopic phase density to get the kinetic
equation for the system of self-propelled particles with Vicsek-like alignment
rule. The hydrodynamic equations are derived for the ordered phase taking into
account the mean-field force only. The equation for the hydrodynamic velocity
plays the role of the Euler equation for the self-propelled Vicsek fluid. The
hydrodynamics of such ideal self-propelled fluid demonstrates the dynamical
transition from disordered initial state to the completely ordered motion. To
take the noise into account we consider how the framework of the local
equilibrium approximation affects the hydrodynamic equations and the viscous
tensor and show that in such approximation the shear viscosity vanishes.

27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph