Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rip models in Ricci-Gauss-Bonnet Cosmology   The ultimate fate of the Universe or the possible occurrence of future
singularity to interpret the cosmic accelerating expansion phenomena has been
discussed in this paper. The gravitational theory comprising of Ricci scalar
$R$ and Gauss-Bonnet invariant $\mathcal{G}$, known as $f(R,\mathcal{G})$
gravity has been considered in the quadratic form. Three models with the Hubble
parameter that represents finite and infinite future time are presented. The
physical and geometrical parameters of the models are analyzed. Also, the
properties of modified gravitational theory have been examined. The fate of the
Universe evolution in this study confronts with neither little or pseudo rip
nor the future singularity. The perturbed evolution equations are formulated in
the scalar perturbation approach and the stability of the models are shown.

10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat