Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic evolution of dark energy in a generalized Rastall gravity   In this work, we propose a scheme for cosmic evolution in a generalized
Rastall gravity. In our approach, the role of dark energy is taken by the
non-conserved sector of the stress energy-momentum tensor. The resultant cosmic
evolution is found to naturally consists of three stages, namely, radiation
dominated, ordinary matter dominated, as well as dark energy and dark matter
dominated eras. Furthermore, for the present model, it is demonstrated that the
eventual fate of the Universe is mostly insensitive to the initial conditions,
in contrast to the standard $\Lambda$CDM model. In particular, the solution
displays the properties of a dynamic attractor, which is reminiscent of
quintessence and k-essence models. Subsequently, the cosmic coincidence problem
is averted. The amount of deviation from a conserved stress energy-momentum
tensor is shown to be more remarkable during the period when the dark energy
evolves more rapidly. On the other hand, the conservation law is largely
restored for the infinite past and future. The implications of the present
approach are addressed.

27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph