Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stochastic motion in an expanding noncommutative fluid   A model for an expanding noncommutative acoustic fluid analogous to a
Friedmann-Robertson-Walker geometry is derived. For this purpose, a
noncommutative Abelian Higgs model is considered in a (3+1)-dimensional
spacetime. In this scenario, we analyze the motion of test particles in this
fluid. The study considers a scalar test particle coupled to a quantized
fluctuating massless scalar field. For all cases studied, we find corrections
due to the noncommutativity in the mean squared velocity of the particles. The
nonzero velocity dispersion for particles that are free to move on geodesics
disagrees with the null result found previously in the literature for expanding
commutative fluid.

4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph