Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exponentially Expanding Radiation Dominated and Dust Dominated Universes
  in Brans-Dicke Theory   The Brans-Dicke Theory of Gravity is one of the most promising alternatives
to the Einstein's Theory of General Relativity. We have examined an action term
with wrong signs for both the kinetic and mass terms for the scalar field and
have found solutions for both the scale factor of the universe and the
Brans-Dicke scalar field which vary exponentially in time.

15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th