Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relic Gravity Waves and 7 keV Dark Matter from a GeV scale inflaton   We study the mechanism of generation of 7 keV sterile neutrino Dark Matter
(DM) in the model with light inflaton $\chi$, which serves as a messenger of
scale invariance breaking. In this model the inflaton, in addition to providing
reheating to the Standard Model (SM) particles, decays directly into sterile
neutrinos. The latter are responsible for the active neutrino oscillations via
seesaw type I like formula. While the two sterile neutrinos may also produce
the lepton asymmetry in the primordial plasma and hence explain the baryon
asymmetry of the Universe, the third one being the lightest may be of 7 keV and
serve as DM. For this mechanism to work, the mass of the inflaton is bound to
be light (0.1-1 GeV) and uniquely determines its properties, which allows to
test the model. For particle physics experiments these are: inflaton lifetime
($10^{-5}-10^{-12}$ s), partial decay width of B-meson to kaon and inflaton
($10^{-6}-10^{-4}$) and inflaton branching ratios into light SM particles like
it would be for the SM Higgs boson of the same mass. For cosmological
experiments these are: spectral index of scalar perturbations
($n_s\simeq0.957-0.967$), and amount of tensor perturbations produced at
inflation (tensor-to-scalar ratio $r\simeq0.15-0.005$).

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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an