Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interaction between scalar field and ideal fluid with inhomogeneous
  equation of state   In this letter we study a model of interaction between the scalar field and
an inhomogeneous ideal fluid. We have considered two forms of the ideal fluid
and a power law expansion for the scale factor. We have solved the equations
for the energy densities. Also we show that besides being a dark energy model
to explain the cosmic acceleration, this model shows a decaying nature of the
scalar field potential and the interaction parameter.

19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin