The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale

Abstract

The recent unidentified 3.5 keV X-ray line signal can be explained by decaying moduli dark matter with a cutoff scale one order of magnitude smaller than the Planck scale. We show that such modulus field with the low cutoff scale follows a time-dependent potential minimum and its abundance is reduced by the adiabatic suppression mechanism. As a result the modulus abundance can naturally be consistent with the observed dark matter abundance without any fine-tuning of the initial oscillation amplitude.

6 pages

References in corpus (5)

• The 7 keV axion dark matter and the X-ray line signal
• X-ray Lines from Dark Matter: The Good, The Bad, and The Unlikely
• PeV-scale Supersymmetry from New Inflation
• Testing the Minimal Direct Gauge Mediation at the LHC
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• A Dynamical Framework for KeV Dirac Neutrino Warm Dark Matter
• SUSY in the sky or a keV signature of sub-GeV gravitino dark matter
• Nonabelian dark matter models for 3.5 keV X-rays
• Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
• 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
• Displaced Vertices from X-ray Lines
• 3.5 keV X-ray line and R-Parity Conserving Supersymmetry
• 3.5 keV Galactic Emission Line as a Signal from the Hidden Sector
• Magnetized matter effects on dilaton photon mixing
• 7 keV sterile neutrino Dark Matter in extended seesaw framework