Dark Matter Signals from Cascade Annihilations

Abstract

A leading interpretation of the electron/positron excesses seen by PAMELA and ATIC is dark matter annihilation in the galactic halo. Depending on the annihilation channel, the electron/positron signal could be accompanied by a galactic gamma ray or neutrino flux, and the non-detection of such fluxes constrains the couplings and halo properties of dark matter. In this paper, we study the interplay of electron data with gamma ray and neutrino constraints in the context of cascade annihilation models, where dark matter annihilates into light degrees of freedom which in turn decay into leptons in one or more steps. Electron and muon cascades give a reasonable fit to the PAMELA and ATIC data. Compared to direct annihilation, cascade annihilations can soften gamma ray constraints from final state radiation by an order of magnitude. However, if dark matter annihilates primarily into muons, the neutrino constraints are robust regardless of the number of cascade decay steps. We also examine the electron data and gamma ray/neutrino constraints on the recently proposed "axion portal" scenario.

36 pages, 11 figures, 7 tables; references added

References in corpus (43)

• A Universal Density Profile from Hierarchical Clustering
• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• Secluded WIMP Dark Matter
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Production and propagation of cosmic-ray positrons and electrons
• Muon Decay and Physics Beyond the Standard Model
• The energy spectrum of cosmic-ray electrons at TeV energies
• Cosmology and Astrophysics of Minimal Dark Matter
• Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Astrophysical Signatures of Secluded Dark Matter
• Model-independent implications of the e+, e-, anti-proton cosmic ray spectra on properties of Dark Matter
• Pulsars as the Sources of High Energy Cosmic Ray Positrons
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• Explosive Dark Matter Annihilation
• PAMELA - A Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics
• Sensitivity of the IceCube Detector to Astrophysical Sources of High Energy Muon Neutrinos
• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• Microwave ISM Emission Observed by WMAP
• Search for Dark Matter WIMPs using Upward Through-going Muons in Super-Kamiokande
• A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
• Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties
• Decaying Dark Matter can explain the electron/positron excesses
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Extended Anomalous Foreground Emission in the WMAP 3-Year Data
• Heavy Dark Matter Through the Higgs Portal
• H.E.S.S. observations of the Galactic Center region and their possible dark matter interpretation
• PAMELA data and leptonically decaying dark matter
• A "Baedecker" for the Dark Matter Annihilation Signal
• Dark Matter Spikes and Annihilation Radiation from the Galactic Center
• Evidence Of Dark Matter Annihilations In The WMAP Haze
• Heavy Wino-like Neutralino Dark Matter Annihilation into Antiparticles
• Observations of the Sagittarius Dwarf galaxy by the H.E.S.S. experiment and search for a Dark Matter signal
• Conservative Constraints on Dark Matter Annihilation into Gamma Rays
• Dark matter and sub-GeV hidden U(1) in GMSB models
• High energy neutrinos from neutralino annihilations in the Sun
• Early Annihilation and Diffuse Backgrounds in 1/v WIMP models
• Cosmic Ray Positron and Electron Excess from Hidden-Fermion Dark Matter Decays
• Radio constraints on dark matter annihilation in the galactic halo and its substructures
• A Supersymmetric B-L Dark Matter Model and the Observed Anomalies in the Cosmic Rays
• Synchrotron Radiation from the Galactic Center in Decaying Dark Matter Scenario

Cited by in corpus (95)

• Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope
• Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray Observations
• Fermi LAT Search for Dark Matter in Gamma-ray Lines and the Inclusive Photon Spectrum
• Semi-annihilation of Dark Matter
• Abelian Hidden Sectors at a GeV
• Strong constraints on self-interacting dark matter with light mediators
• The Case for a 700+ GeV WIMP: Cosmic Ray Spectra from PAMELA, Fermi and ATIC
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Model-Independent Indirect Detection Constraints on Hidden Sector Dark Matter
• Fitting the Galactic Center Gamma-Ray Excess with Cascade Annihilations
• Dark matter constraints from box-shaped gamma-ray features
• High Energy Positrons From Annihilating Dark Matter
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• Dark Matter Complementarity and the Z${}^{\prime }$ Portal
• Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies
• Nonabelian dark matter: models and constraints
• Is the PAMELA anomaly caused by the supernova explosions near the Earth?
• Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
• VERITAS Deep Observations of the Dwarf Spheroidal Galaxy Segue 1
• The PAMELA Positron Excess from Annihilations into a Light Boson
• Terrestrial and Solar Limits on Long-Lived Particles in a Dark Sector
• BBN constraints on MeV-scale dark sectors. Part II. Electromagnetic decays
• Constraints on dark matter annihilation from CMB observations before Planck
• BBN constraints on the annihilation of MeV-scale dark matter
• Multi-Step Cascade Annihilations of Dark Matter and the Galactic Center Excess
• Constraints on dark matter annihilation from AMS-02 results
• Cosmic Signals from the Hidden Sector
• Parameters in a Class of Leptophilic Dark Matter Models from PAMELA, ATIC and FERMI
• Indirect Detection of Neutrino Portal Dark Matter
• Dark Matter Sees The Light
• Prospects for indirect dark matter searches with MeV photons
• Hazma: A Python Toolkit for Studying Indirect Detection of Sub-GeV Dark Matter
• Extragalactic Inverse Compton Light from Dark Matter Annihilation and the Pamela Positron Excess
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Phenomenology of Dark Matter annihilation into a long-lived intermediate state
• High Energy Electron Signals from Dark Matter Annihilation in the Sun
• PAMELA, DAMA, INTEGRAL and Signatures of Metastable Excited WIMPs
• Limits from BBN on Light Electromagnetic Decays
• Conservative Constraints on Dark Matter from the Fermi-LAT Isotropic Diffuse Gamma-Ray Background Spectrum
• Searching for Secluded Dark Matter with H.E.S.S., Fermi-LAT, and Planck
• Signals of a Light Dark Force in the Galactic Center
• Constraints on WIMP and Sommerfeld-Enhanced Dark Matter Annihilation from HESS Observations of the Galactic Center
• Dark matter and collider phenomenology of split-UED
• ATIC, PAMELA, HESS, Fermi and nearby Dark Matter subhalos
• Two component dark matter
• Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
• Multimediator models for the galactic center gamma ray excess
• Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess
• Dark Forces in the Sky: Signals from Z' and the Dark Higgs
• Gamma Lines without a Continuum: Thermal Models for the Fermi-LAT 130 GeV Gamma Line
• Antiprotons from dark matter annihilation through light mediators and a possible excess in AMS-02 $\bar{p}/p$ data
• Decaying into the Hidden Sector
• Lifetime Constraints for Late Dark Matter Decay
• Precise dark matter relic abundance in decoupled sectors
• Search for right-handed neutrinos from dark matter annihilation with gamma-rays
• Nearly Supersymmetric Dark Atoms
• On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter
• TeV dark matter and the DAMPE electron excess
• Strong Optimized Conservative Fermi-LAT Constraints on Dark Matter Models from the Inclusive Photon Spectrum
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
• Annihilation Signals from Asymmetric Dark Matter
• Fermi-LAT kills dark matter interpretations of AMS-02 data. Or not?
• On-shell mediator dark matter models and the Xenon1T anomaly
• Multi-messenger constraints on the annihilating dark matter interpretation of the positron excess
• Constraints on box-shaped cosmic ray electron feature from dark matter annihilation with the AMS-02 and DAMPE data
• Secluded Dark Matter Coupled to a Hidden CFT
• Exploration of decaying dark matter in a left-right symmetric model
• Cosmic Ray Positrons from Annihilations into a New, Heavy Lepton
• The DAMPE excess and gamma-ray constraints
• Toward the ultimate reach of current imaging atmospheric Cherenkov telescopes and their sensitivity to TeV dark matter
• Indirect searches for dark matter bound state formation and level transitions
• Gamma-ray signatures of annihilation to charged leptons in dark matter substructure
• Sommerfeld-Enhanced Annihilation in Dark Matter Substructure: Consequences for Constraints on Cosmic-Ray Excesses
• The Electron Injection Spectrum Determined by Anomalous Excesses in Cosmic Ray, Gamma Ray, and Microwave Signals
• Comment on Calculation of Positron Flux from Galactic Dark Matter
• Lepton-Flavor Violating Mediators
• Astrophysical Implications of a Visible Dark Matter Sector from a Custodially Warped-GUT
• Decaying Hidden Dark Matter in Warped Compactification
• Protohalo Constraints to the Resonant Annihilation of Dark Matter
• ACROPOLIS: A generiC fRamework fOr Photodisintegration Of LIght elementS
• Asymmetric dark matter with a spontaneously broken $U(1{)}^{\prime }$: self-interaction and gravitational waves
• Dark Matter, Shared Asymmetries, and Galactic Gamma Ray Signals
• Dark Matter Identification with Gamma Rays from Dwarf Galaxies
• Cascade supersymmetry breaking and low-scale gauge mediation
• Clumpiness enhancement of charged cosmic rays from dark matter annihilation with Sommerfeld effect
• Dark Matter Decaying into a Fermi Sea of Neutrinos
• Two-mediator dark matter models and cosmic electron excess
• On discrepancy between ATIC and Fermi data
• Hidden Higgs Portal Vector Dark Matter for the Galactic Center Gamma-Ray Excess from the Two-Step Cascade Annihilation, and Muon g-2
• The case for three-body decaying dark matter
• Oscillating Composite Asymmetric Dark Matter
• Enhancements to velocity-dependent dark matter interactions from tidal streams and shells in the Andromeda galaxy
• Axion Portal to Scalar Dark Matter: Unveiling Stabilizing Symmetry Footprints
• Composite asymmetric dark matter with a dark photon portal: Multimessenger tests
• A New Approach to Searching for Dark Matter Signals in Fermi-LAT Gamma Rays