Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 7 keV Dark Matter as X-ray Line Signal in Radiative Neutrino Model   We study a light dark matter in a radiative neutrino model to explain the
X-ray line signal at about $3.5$ keV recently reported by XMN-Newton X-ray
observatory using data of various galaxy clusters and Andromeda galaxy. The
signal requires very tiny mixing between the dark matter and an active
neutrino; $\sin^2 2\theta\approx 10^{-10}$. It could suggest that such a light
dark matter cannot contribute to the observed neutrino masses if we use the
seesaw mechanism. In other words, neutrino masses might come a structure
different from the dark matter. We propose a model in which Dirac type active
neutrino masses are induced at one-loop level. On the other hand the mixing
between active neutrino and dark matter are generated at two-loop level. As a
result we can explain both the observed neutrino masses and the X-ray line
signal from the dark matter decay with rather mild hierarchy of parameters in
TeV scale.

1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
18
The categories of this paper are: econ
3
The categories of this paper are: physics
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph