Pico-charged intermediate particles rescue dark matter interpretation of 511 keV signal

Abstract

Various alleged indirect dark matter search signals, such as the 511 keV line from galaxy center or the PAMELA/AMS02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or from the absence of an impact on CMB through delayed recombination. We propose a novel scenario that can avoid these bounds based on the decay of dark matter, X, to a pair of intermediate particles C and \bar{C} with a lifetime much greater than the age of universe. The annihilation of these intermediate particles eventually leads to a dark matter signal. The bounds from CMB can be easily avoided by the fact that at the time of recombination, not enough C particles had been accumulated. In order to keep C particles from leaving the galaxy, we assume the particles have a small electric charge so in the galactic disk, the magnetic field keeps the C particles in the vicinity of their production. However, they can escape the dwarf galaxies and the dark matter halo where the magnetic field is weak, leading to null signal from these regions. The small charge can have interesting consequences including a signal in direct dark matter searches.

arXiv comment10 pages, 1 figure

References in corpus (29)

• MeV Dark Matter: Has It Been Detected?
• Updated Bounds on Milli-Charged Particles
• New Constraints and Prospects for sub-GeV Dark Matter Scattering off Electrons in Xenon
• The Stueckelberg $Z^{\prime }$ Extension with Kinetic Mixing and Milli-Charged Dark Matter From the Hidden Sector
• Projected Sensitivity of the SuperCDMS SNOLAB experiment
• General Constraints on Dark Matter Decay from the Cosmic Microwave Background
• Stringent Constraint on Galactic Positron Production
• Diffuse X-ray Emission in a Deep Chandra Image of the Galactic Center
• Coherent Propagation of PeV Neutrinos and the Dip in the Neutrino Spectrum at IceCube
• Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
• Direct dark matter detection: the next decade
• Reopening the window on charged dark matter
• LUX-ZEPLIN (LZ) Conceptual Design Report
• Evidence for a Weak Galactic Center Magnetic Field from Diffuse Low Frequency Nonthermal Radio Emission
• Are small neutrino masses unveiling the missing mass problem of the Universe?
• Strongest model-independent bound on the lifetime of Dark Matter
• Novel cosmic-ray electron and positron constraints on MeV dark matter particles
• Continuum gamma-ray emission from light dark matter positrons and electrons
• First results of the EDELWEISS-II WIMP search using Ge cryogenic detectors with interleaved electrodes
• A minimal model linking two great mysteries: neutrino mass and dark matter
• Extending the CRESST-II commissioning run limits to lower masses
• Ruling out the light WIMP explanation of the galactic 511 keV line
• Dark matter in the Reticulum II dSph: a radio search
• Search for 511 keV Emission in Satellite Galaxies of the Milky Way with INTEGRAL/SPI
• A prototype detector for the CRESST-III low-mass dark matter search
• Probing low WIMP masses with the next generation of CRESST detector
• On the Origin of the 511 keV Emission in the Galactic Centre
• BBN with light dark matter
• Direct Dark Matter Search with the CRESST II Experiment

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• The 511 keV Excess and Primordial Black Holes
• The Sensitivity of Future Gamma-Ray Telescopes to Primordial Black Holes
• Dark Matter Decaying into Millicharged Particles as a Solution to AMS 02 Positron Excess
• The Morphology of Exciting Dark Matter and the Galactic 511 keV Signal
• Millicharged Particles from the Heavens: Single- and Multiple-Scattering Signatures