Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodic distribution of galaxies in generalized scalar tensor theory   With the help of Nordtvedt's scalar tensor theory an exact analytical model
of a non-minimally coupled scalar field cosmology in which the gravitational
coupling $G$ and the Hubble factor $H$ oscillate during the radiation era is
presented. A key feature is that the oscillations are confined to the early
stages of the radiation dominated era with $G$ approaching its present constant
value while $H$ becoming a monotonically decreasing function of time. The Brans
Dicke parameter $\omega$ is chosen to be a function of Brans Dicke scalar field
so that no conflict with observational constraints regarding its present value
arises.

14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas