7 keV Dark Matter as X-ray Line Signal in Radiative Neutrino Model

Abstract

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.

7 pages, 2 figures, 2 tables: references are added

Cited by in corpus (14)

• 3.55 keV photon lines from axion to photon conversion in the Milky Way and M31
• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• 7 keV Scalar Dark Matter and the Anomalous Galactic X-ray Spectrum
• Decaying Vector Dark Matter as an Explanation for the 3.5 keV Line from Galaxy Clusters
• SUSY in the sky or a keV signature of sub-GeV gravitino dark matter
• 3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays
• X-ray Line from the Dark Transition Electric Dipole
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• 3.5 keV X-ray line and R-Parity Conserving Supersymmetry
• ${\nu }_R$ dark matter-philic Higgs for 3.5 keV X-ray signal
• Two-loop Induced Majorana Neutrino Mass in a Radiatively Induced Quark and Lepton Mass Model
• 3.5 keV Galactic Emission Line as a Signal from the Hidden Sector
• Supersymmetric Higgs-portal and X-ray lines
• 7 keV sterile neutrino Dark Matter in extended seesaw framework