Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymptotic and Exact Solutions of Perfect-Fluid Scalar-Tensor
  Cosmologies   We present a method which enables exact solutions to be found for at
homogeneous and isotropic scalar-tensor cosmologies with an arbitrary
$\omega(\Phi)$ function and satisfying the general perfect fluid state equation
$P=(\gamma-1)\rho c^2$. This method has been used to analyze a wide range of
asymptotic analytical solutions at early and late times for different epochs in
the cosmic history: false vacuum inflationary models, vacuum and
radiation-dominated models, and matter-dominated models. We also describe the
qualitative behavior of models at intermediary times and give exact solutions
at any time for some particular scalar-tensor theories.

37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th