Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical non-Gaussianity from non-linear evolution of curvature
  perturbations   We study the non-linear evolution of the curvature perturbations during
matter dominated era. We show that regardless of the origin of the primordial
perturbation, the Bardeen potential and curvature receive sizable contributions
from the classical non-linear evolution effects, and quantify them exactly. On
the super-horizon scales we have squeezed peak of the bispectrum with
magnitude, in terms of the local non-linear parameters of Bardeen curvature,
1/6 < f_{NL} 19/15, and of Bardeen potential, -1/4 < f_{NL} < 7/5, depending on
the configuration of momenta. On the sub-horizon scales the bispectrum show
equilateral shape, and can serve as a potential probe of general relativity.

30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex