Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unification of a Bounce with a Viable Dark Energy Era in Gauss-Bonnet
  Gravity   In this work we shall demonstrate that it is possible to describe in a
unified way a primordial bounce with the dark energy era, in the context of
Gauss-Bonnet modified gravity. Particularly, the early time bounce has a nearly
scale invariant power spectrum of primordial scalar curvature perturbations,
while the dark energy era is a viable one, meaning that it mimics the
$\Lambda$-Cold-Dark-Matter model and also is compatible with the Planck 2018
data on cosmological parameters. In addition, our analysis indicates that the
dark energy era is free from dark energy oscillations, which occur in the
context of $f(R)$ gravity. We further addressed the later issue by examining
$f(R)$ extensions of Gauss-Bonnet models, and we showed that the $f(R)$ gravity
part of the action actually produces the dark energy oscillations at redshifts
$z\sim 4$.

0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess