Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Riemann problem to the stochastically perturbed non-viscous Burgers
  equation and the pressureless gas dynamics model   Proceeding from the method of stochastic perturbation of a Langevin system
associated with the non-viscous Burgers equation we construct a solution to the
Riemann problem for the non-interacting particles and sticky particles systems.
We analyze the difference in the behavior of discontinuous solutions for these
two models and relations between them.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat