Generating X-ray lines from annihilating dark matter

Abstract

We propose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural values of the couplings and scales, the model can generate a gamma-ray line which can fit with the recently identified 3.5 keV X-ray line.

10 pages, 8 figures

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• 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
• X-ray line in Radiative Neutrino Model with Global $U(1)$ Symmetry
• A Dynamical Framework for KeV Dirac Neutrino Warm Dark Matter
• Decaying Vector Dark Matter as an Explanation for the 3.5 keV Line from Galaxy Clusters
• Nonabelian dark matter models for 3.5 keV X-rays
• 3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays
• X-ray Line from the Dark Transition Electric Dipole
• Exploring X-Ray Lines as Scotogenic Signals
• Displaced Vertices from X-ray Lines
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• A 3.55 keV Line from Exciting Dark Matter without a Hidden Sector
• 3.5 keV X-ray line and R-Parity Conserving Supersymmetry
• ${\nu }_R$ dark matter-philic Higgs for 3.5 keV X-ray signal
• 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
• The Dark Penguin Shines Light at Colliders