Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Brane inflation and the robustness of the Starobinsky inflationary model   The first inflationary model conceived was the one proposed by Starobinsky
which includes an additional term quadratic in the Ricci-scalar R in the
Einstein-Hilbert action. The model is now considered a target for several
future cosmic microwave background experiments given its compatibility with
current observational data. In this paper, we analyse the robustness of the
Starobinsky inflation by inserting it into a generalized scenario based on a
$\beta$-Starobinsky inflation potential, which is motivated through brane
inflation. In the Einstein frame, the generalized model recovers the original
model for $\beta=0$, whereas $\forall \beta \neq 0$ represents an extended
class of models that admit a wider range of solutions. We investigate limits on
$\beta$ from current cosmic microwave background and baryonic acoustic
oscillation data and find that only a small deviation from the original
scenario is allowed, $\beta=-0.08 \pm 0.12$ (68% C.L.), which is fully
compatible with zero and confirms the robustness of the Starobinsky
inflationary model in light of current observations.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
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
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys