Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards a possible solution for the coincidence problem: f(G) gravity as
  background   In this article we address the well-known cosmic coincidence problem in the
framework of the f(G) gravity. In order to achieve this, an interaction between
dark energy and dark matter is considered. A set-up is designed and a
constraint equation is obtained which generates the f(G) models that do not
suffer from the coincidence problem. Due to the absence of a universally
accepted interaction term introduced by a fundamental theory, the study is
conducted over three different forms of logically chosen interaction terms. To
illustrate the set-up three widely known models of f(G) gravity are taken into
consideration and the problem is studied under the designed set-up. The study
reveals that the popular f(G) gravity models does not approve of a satisfactory
solution of the long standing coincidence problem, thus proving to be a major
setback for them as successful models of universe. Finally, two
non-conventional models of f(G) gravity have been proposed and studied in the
framework of the designed set-up. It is seen that a complete solution of the
coincidence problem is achieved for these models. The study also reveals that
the b-interaction term is much more preferable compared to the other
interactions, due to its greater compliance with the recent observational data.

2
The categories of this paper are: math
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th