Axino dark matter with R-parity violation and 130 GeV gamma-ray line

Abstract

We show that decaying axino dark matter with R-parity violation can explain the observed excess of the 130GeV gamma-ray line from the Galactic center in the Fermi data. The branching fraction of the axino decay into monochromatic photons can be O(1), and constraints from continuum gamma-rays and the anti-proton flux are ameliorated. The Peccei-Quinn scale of $O(10^{13}-10^{14})$\,GeV and the R-parity violation parameter of $O(10^{-12}-10^{-11})$ are cosmologically favored.

16 pages, 2 figures, matches published version

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• Searching for the continuum spectrum photons correlated to the 130 GeV gamma-ray line
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• Dark radiation and small-scale structure problems with decaying particles
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• R-parity Violating Right-Handed Neutrino in Gravitino Dark Matter Scenario

Cited by in corpus (7)

• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• X-ray line signal from decaying axino warm dark matter
• MeV-GeV $\gamma$-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the $\mu \nu$SSM
• A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA
• Qualities of axion and LSP in Pati-Salam unification with $Z_4^R\times Z_N$ symmetry
• Axino Dark Matter in Moduli-induced Baryogenesis
• WIMP Dark Matter in the U$\mu \nu$SSM