Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inflation driven by a holographic energy density   In this letter we study a model of inflation in which the inflationary
regimen comes from a type of holographic energy density. In particular, we
consider the Granda-Oliveros proposal for the holographic energy density, which
contains two free dimensionless parameters, $\alpha$ and $\beta$. This
holographic energy density is associated to the so-called Granda-Oliveros
infrared cutoff (G-O cutoff). Additionally, since in the inflationary regimen
the energy scales are very high, it is necessary to modify the G-O cutoff
taking into account a correction due to the ultraviolet cutoff. In this way, we
obtain an algebraic equation which implicitly includes the Hubble parameter (as
a function of e-folding number, $N$) and from this, we calculate the Hubble
slow-roll parameters and the values of the inflationary observables: the scalar
spectral index of the curvature perturbations and its running, the tensor
spectral index and the tensor-to-scalar ratio. Finally, since the values for
these inflationary observables are known (Planck 2018 observations), we present
constraints on the parameters $\alpha$ and $\beta$ to make this a viable model.

22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol