Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological inflation in $F(R,\mathcal{G})$ gravity   Cosmological inflation is discussed in the framework of $F(R,{\cal G})$
gravity where $F$ is a generic function of the curvature scalar $R$ and the
Gauss-Bonnet topological invariant $\cal G$. The main feature that emerges in
this analysis is the fact that this kind of theory can exhaust all the
curvature budget related to curvature invariants without considering
derivatives of $R,$ $R_{\mu\nu}$, $R^{\lambda}_{\sigma\mu\nu}$ etc. in the
action. Cosmological dynamics results driven by two effective masses (lenghts)
related to the $R$ scalaron and the $\cal G$ scalaron working respectively at
early and very early epochs of cosmic evolution. In this sense, a double
inflationary scenario naturally emerges.

10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
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The categories of this paper are: econ
23
The categories of this paper are: solv-int