Dark Matter "Transporting" Mechanism Explaining Positron Excesses

Abstract

We propose a novel mechanism to explain the positron excesses, which are observed by satellite-based telescopes including PAMELA and AMS-02, in dark matter (DM) scenarios. The novelty behind the proposal is that it makes direct use of DM around the Galactic Center where DM populates most densely, allowing us to avoid tensions from cosmological and astrophysical measurements. The key ingredients of this mechanism include DM annihilation into unstable states with a very long laboratory-frame life time and their "retarded" decay near the Earth to electron-positron pair(s) possibly with other (in)visible particles. We argue that this sort of explanation is not in conflict with relevant constraints from big bang nucleosynthesis and cosmic microwave background. Regarding the resultant positron spectrum, we provide a generalized source term in the associated diffusion equation, which can be readily applicable to any type of two-"stage" DM scenarios wherein production of Standard Model particles occurs at completely different places from those of DM annihilation. We then conduct a data analysis with the recent AMS-02 data to validate our proposal.

14 pages, 3 figures

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Cited by in corpus (14)

• Les Houches Lectures on Indirect Detection of Dark Matter
• Explaining the ANITA Anomaly with Inelastic Boosted Dark Matter
• Gamma rays from dark mediators in white dwarfs
• Probing Energetic Light Dark Matter with Multi-Particle Tracks Signatures at DUNE
• Searching for Boosted Dark Matter via Dark-Strahlung
• Non-Minimal Dark Sectors: Mediator-Induced Decay Chains and Multi-Jet Collider Signatures
• Dark Matter Decaying into Millicharged Particles as a Solution to AMS 02 Positron Excess
• Optimizing Energetic Light Dark Matter Searches in Dark Matter and Neutrino Experiments
• Simple Hidden Sector Dark Matter
• Wobbly Dark Matter Signals at Cherenkov Telescopes from Long Lived Mediator Decays
• Vector Self-Interacting Dark Matter
• Realization of Sneutrino Self-interacting Dark Matter in the Focus Point Supersymmetry
• Indirect detection of long-lived particles in a rich dark sector with a dark vector portal
• Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies