Connecting direct and indirect detection with a dark spike in the cosmic-ray electron spectrum

Abstract

Multiple space-borne cosmic ray detectors have detected line-like features in the electron and positron spectra. Most recently, the DAMPE collaboration reported the existence of such a feature at 1.4 TeV, sparking interest in a potential dark matter origin. Such quasi-monochromatic features, virtually free of any astrophysical background, could be explained by the annihilation of dark matter particles in a nearby dark matter clump. Here, we explore the consistency of producing such spectral features with dark matter annihilation from the standpoint of dark matter substructure statistics, constraints from anisotropy, and constraints from gamma-ray emission. We demonstrate that if indeed a high-energy, line-like feature in the electron-positron spectrum originates from dark matter annihilation in a nearby clump, a significant or even dominant fraction of the dark matter in the Solar System likely stems from the clump, with dramatic consequences for direct dark matter searches.

arXiv comment30 pages, 11 figures

References in corpus (51)

• The Structure of Cold Dark Matter Halos
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Cosmic-ray propagation and interactions in the Galaxy
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Implication of neutrino backgrounds on the reach of next generation dark matter direct detection experiments
• The energy spectrum of cosmic-ray electrons at TeV energies
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• The Local Dark Matter Density
• Dark matter substructure and gamma-ray annihilation in the Milky Way halo
• Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
• ELVIS: Exploring the Local Volume in Simulations
• Density Profiles of Cold Dark Matter Substructure: Implications for the Missing Satellites Problem
• Multi-frequency analysis of neutralino dark matter annihilations in the Coma cluster
• Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos
• The flattening of the concentration-mass relation towards low halo masses and its implications for the annihilation signal boost
• Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station
• A New Probe of Dark Matter and High-Energy Universe Using Microlensing
• Interpretation of AMS-02 electrons and positrons data
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• Inverse Compton constraints on the Dark Matter e+e- excesses
• Constraints on Dark Matter in the Solar System
• Fitting the Gamma-Ray Spectrum from Dark Matter with DMFIT: GLAST and the Galactic Center Region
• Phat ELVIS: The inevitable effect of the Milky Way's disk on its dark matter subhaloes
• Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
• Primordial Black Holes as Dark Matter: Almost All or Almost Nothing
• Weighing the local dark matter with RAVE red clump stars
• Diffuse Galactic gamma-ray emission with H.E.S.S
• Gamma rays from ultracompact primordial dark matter minihalos
• Lessons from HAWC PWNe observations: the diffusion constant is not a constant; Pulsars remain the likeliest sources of the anomalous positron fraction; Cosmic rays are trapped for long periods of time in pockets of inefficient diffusion
• Constraints on Decaying Dark Matter from Fermi Observations of Nearby Galaxies and Clusters
• Mini-dark halos with intermediate mass black holes
• Very-high-energy gamma radiation associated with the unshocked wind of the Crab pulsar
• Origin of Small-Scale Anisotropies in Galactic Cosmic Rays
• Extragalactic Inverse Compton Light from Dark Matter Annihilation and the Pamela Positron Excess
• Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
• Studying the solar system with the International Pulsar Timing Array
• Constraints on Dark Matter Annihilation in Clusters of Galaxies from Diffuse Radio Emission
• The Via Lactea INCITE Simulation: Galactic Dark Matter Substructure at High Resolution
• Is the Concentration of Dark Matter Halos at Virialization Universal ?
• Galactoseismology and the Local Density of Dark Matter
• Multiwavelength Analysis of Dark Matter Annihilation and RX-DMFIT
• A Multi-Wavelength Analysis of Annihilating Dark Matter as the Origin of the Gamma-Ray Emission from M31
• Flavor Structure of the Cosmic-Ray Electron/Positron Excesses at DAMPE
• Gamma Rays From Dark Matter Subhalos Revisited: Refining the Predictions and Constraints
• DAMPE squib? Significance of the 1.4 TeV DAMPE excess
• 3FGL J1924.8-1034 : A Spatially-Extended Stable Unidentified GeV Source?
• Dark Matter Detection with Hard X-ray Telescopes
• GALPROP cosmic-ray propagation code: recent results and updates
• An observable electron-positron anisotropy cannot be generated by dark matter

Cited by in corpus (5)

• StellarICS: Inverse Compton Emission from the Quiet Sun and Stars from keV to TeV
• Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario
• Confronting cosmic ray electron and positron excesses with hybrid triplet Higgs portal dark matter
• Is PSR J0855$-$4644 responsible for the 1.4 TeV electron spectral bump hinted by DAMPE?
• Research on electron and positron spectrum in the high-energy region based on the gluon condensation model