Dynamical Dark Matter and the Positron Excess in Light of AMS

Abstract

The AMS-02 experiment has recently released data which confirms a rise in the cosmic-ray positron fraction as a function of energy up to approximately 350 GeV. Over the past decade, attempts to interpret this positron excess in terms of dark-matter decays have become increasingly complex and have led to a number of general expectations about the decaying dark-matter particles: such particles cannot undergo simple two-body decays to leptons, for example, and they must have rather heavy TeV-scale masses. In this paper, by contrast, we show that Dynamical Dark Matter (DDM) can not only match existing AMS-02 data on the positron excess, but also accomplish this feat with significantly lighter dark-matter constituents undergoing simple two-body decays to leptons. Moreover, we demonstrate that this can be done without running afoul of numerous other competing constraints from FERMI and Planck on decaying dark matter. Finally, we demonstrate that the Dynamical Dark Matter framework makes a fairly robust prediction that the positron fraction should level off and then remain roughly constant out to approximately 1 TeV, without experiencing any sharp downturns. Indeed, if we interpret the positron excess in terms of decaying dark matter, we find that the existence of a plateau in the positron fraction at energies less than 1 TeV may be taken as a "smoking gun" of Dynamical Dark Matter.

arXiv comment20 pages, LaTeX, 6 figures. v2: Additional material and discussion included. Revised to match published version

References in corpus (80)

• The Structure of Cold Dark Matter Halos
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observation of an anomalous positron abundance in the cosmic radiation
• String Axiverse
• A Theory of Dark Matter
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
• Astrophysical Signatures of Secluded Dark Matter
• PAMELA results on the cosmic-ray antiproton flux from 60 MeV to 180 GeV in kinetic energy
• 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
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Measurements of the Cosmic-Ray Positron Fraction From 1 to 50 GeV
• Particle decays during the cosmic dark ages
• Antiprotons in cosmic rays from neutralino annihilation
• Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
• Detecting Dark Matter Annihilation with CMB Polarization : Signatures and Experimental Prospects
• CMB constraints on Dark Matter models with large annihilation cross-section
• High resolution CMB power spectrum from the complete ACBAR data set
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• The origin of the positron excess in cosmic rays
• New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?
• Leptophilic Dark Matter
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• A Measurement of the CMB <EE> Spectrum from the 2003 Flight of BOOMERANG
• Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties
• New limits on dark matter annihilation from AMS cosmic ray positron data
• Dark Matter through the Axion Portal
• Multi-Component Dark Matter
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• Diffuse gamma ray constraints on annihilating or decaying Dark Matter after Fermi
• PAMELA data and leptonically decaying dark matter
• WIMPonium and Boost Factors for Indirect Dark Matter Detection
• Dynamical Dark Matter: I. Theoretical Overview
• A statistical procedure for the identification of positrons in the PAMELA experiment
• Probing the Pulsar Origin of the Anomalous Positron Fraction with AMS-02 and Atmospheric Cherenkov Telescopes
• Dark Matter and Pulsar Origins of the Rising Cosmic Ray Positron Fraction in Light of New Data From AMS
• Energy Injection And Absorption In The Cosmic Dark Ages
• PAMELA and dark matter
• High Energy Positrons From Annihilating Dark Matter
• Gamma ray constraints on Decaying Dark Matter
• Testing astrophysical models for the PAMELA positron excess with cosmic ray nuclei
• Dynamical Dark Matter: II. An Explicit Model
• An Effective Theory of Dirac Dark Matter
• Robust implications on Dark Matter from the first FERMI sky gamma map
• Decaying Dark Matter in Light of the PAMELA and Fermi LAT Data
• Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station
• The PAMELA Positron Excess from Annihilations into a Light Boson
• Cosmic Gamma-Ray Background from Star-Forming Galaxies
• Components of the Extragalactic Gamma Ray Background
• Antimatter Signatures of Gravitino Dark Matter Decay
• Annihilation Radiation from a Dark Matter Spike at the Galactic Centre
• The Pulsar Contribution to the Gamma-Ray Background
• Pulsar interpretation for the AMS-02 result
• Consistent Scenarios for Cosmic-Ray Excesses from Sommerfeld-Enhanced Dark Matter Annihilation
• Is the PAMELA Positron Excess Winos?
• Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
• Astrophysical Limits on Massive Dark Matter
• Multiple dark matter scenarios from ubiquitous stringy throats
• Low energy cosmic ray positron fraction explained by charge-sign dependent solar modulation
• Distinguishing Dynamical Dark Matter at the LHC
• The Contribution of Blazars to the Extragalactic Diffuse Gamma-ray Background and Their Future Spatial Resolution
• Generic dark matter signature for gamma-ray telescopes
• Synchrotron Radiation from the Galactic Center in Decaying Dark Matter Scenario
• Interpretation of AMS-02 Results: Correlations among Dark Matter Signals
• Phenomenological Constraints on Axion Models of Dynamical Dark Matter
• Direct Detection of Dynamical Dark Matter
• Constraining Supersymmetric Dark Matter With Synchrotron Measurements
• Galactic Signatures of Decaying Dark Matter
• Charge Asymmetric Cosmic Ray Signals From Dark Matter Decay
• Constraining Decaying Dark Matter with Fermi LAT Gamma-rays
• AMS-02 Positrons from Decaying Wino in the Pure Gravity Mediation Model
• Slightly Non-Minimal Dark Matter in PAMELA and ATIC
• Recent Result of the AMS-02 Experiment and Decaying Gravitino Dark Matter in Gauge Mediation
• Dark matter electron anisotropy: a universal upper limit
• Novel Techniques for Decomposing Diffuse Backgrounds
• The case for three-body decaying dark matter

Cited by in corpus (39)

• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Interpretation of AMS-02 electrons and positrons data
• Detecting Dark Matter with Imploding Pulsars in the Galactic Center
• Where do the AMS-02 anti-helium events come from?
• A Possible Explanation of Low Energy $\gamma$-ray Excess from Galactic Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars
• Dynamical Dark Matter from Strongly-Coupled Dark Sectors
• Constraining the origin of the rising cosmic ray positron fraction with the boron-to-carbon ratio
• Neutrino Mass and Dark Matter in light of recent AMS-02 results
• Multi-component dark matter from a hidden gauged SU(3)
• Possible Evidence for the Stochastic Acceleration of Secondary Antiprotons by Supernova Remnants
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Multi-Component Dark Matter in a Non-Abelian Dark Sector
• Imprint of Multi-component Dark Matter on AMS-02
• Indirect and direct signatures of Higgs portal decaying vector dark matter for positron excess in cosmic rays
• Lines and Boxes: Unmasking Dynamical Dark Matter through Correlations in the MeV Gamma-Ray Spectrum
• Strategies for Probing Non-Minimal Dark Sectors at Colliders: The Interplay Between Cuts and Kinematic Distributions
• Dynamical Dark Matter, MATHUSLA, and the Lifetime Frontier
• Boxes, Boosts, and Energy Duality: Understanding the Galactic-Center Gamma-Ray Excess through Dynamical Dark Matter
• Features in the Spectrum of Cosmic-Ray Positrons from Pulsars
• Revisiting Multi-Component Dark Matter with New AMS-02 Data
• AMS-02 Positron Excess and Indirect Detection of Three-body Decaying Dark Matter
• Dynamical Dark Matter from Thermal Freeze-Out
• Non-Minimal Dark Sectors: Mediator-Induced Decay Chains and Multi-Jet Collider Signatures
• Constraining Dark-Matter Ensembles with Supernova Data
• Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars
• Randomness in the Dark Sector: Emergent Mass Spectra and Dynamical Dark Matter Ensembles
• Kaluza-Klein Towers in the Early Universe: Phase Transitions, Relic Abundances, and Applications to Axion Cosmology
• Low-Temperature Enhancement of Semi-annihilation and the AMS-02 Positron Anomaly
• Revisiting GeV-scale annihilating dark matter with the AMS-02 positron fraction
• Cosmic Ray Excesses from Multi-component Dark Matter Decays
• Decaying WIMP dark matter for AMS-02 cosmic positron excess
• Two component dark matter with multi-Higgs portals
• Observing Signals of Spectral Features in the Cosmic-Ray Positrons and Electrons from Milky Way Pulsars
• Dark matter annihilation into leptons through gravity portals
• Explaining the AMS positron excess via Right-handed Neutrinos
• Possible counterpart signal of the Fermi bubbles at the cosmic-ray positrons
• Multicomponent Dark Matter in the Light of CALET and DAMPE
• The Forward Physics Facility at the High-Luminosity LHC
• Possible spectral irregularities in the AMS-02 positron spectrum