Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on scalar-tensor theories from observations   We study the dynamical description of scalar-tensor gravity by performing the
best-fit analysis for two cases of exponential and power-law form of the
potential and scalar field function coupled to the curvature. The models are
then tested against observational data. The results show that in both scenarios
the Universe undergoes an acceleration expansion period and the geometrical
equivalent of dark energy is associated with a time-dependent equation of
state.

16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an