Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinetic gravity braiding and natural inflation in the light of BICEP2
  and PLANCK   Based on our previous work, we constructed a phenomenological model of
inflation with the higher derivative axion field in the light of recent
cosmological expertiments BICEP2 and PLANCK. In order to achieve observed
values for the important cosmological parameters $(n_s,r)$ we employ higher
derivative kinetic term called kinetic gravity braiding (KGB) for the axion in
compatible with the constant shift symmetry. Phenomenologically we choose a
particular form of the braiding function $M(\phi)$ which correctly reproduces
the observed value of $(n_s, r)$ based on the recent cosmological observations.
Furthermore we also find axion decay constant $f$ and the scale of inflation
$\Lambda$ to be naturally sub-Planckian consistent with the reheating after the
end of inflation. Within the sufficient number of e-folding ${\cal N}$, we also
find sub-Planckian field excursion for the axion field $\Delta \phi \simeq f$.

3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat