Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of Rastall parameter on perturbation of dark sectors of the
  Universe   In recent years, Rastall gravity is undergoing a considerable surge in
popularity. This theory purports to be a modified gravity theory with a
non-conserved energy-momentum tensor ({\rm EMT}) and an unusual non-minimal
coupling between matter and geometry. The present work looks for the evolution
of homogeneous spherical perturbations within the Universe in the context of
Rastall gravity. Using the spherical Top-Hat collapse model we seek for exact
solutions in linear regime for density contrast of dark matter (\rm DM) and
dark energy ({\rm DE}). We find that the Rastall parameter affects crucially
the dynamics of density contrasts for {\rm DM} and {\rm DE} and the fate of
spherical collapse is different in comparison to the case of general relativity
({\rm GR}). Numerical solutions for perturbation equations in non-linear regime
reveal that {\rm DE} perturbations could amplify the rate of growth of {\rm DM}
perturbations depending on the values of Rastall parameter.

37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat