Gamma-rays From Warm WIMP Dark Matter Annihilation

Abstract

The weakly interacting massive particle (WIMP) often serves as a candidate for the cold dark matter, however when produced non-thermally it could behave like warm dark matter. In this paper we study the properties of the $\gamma$-ray emission from annihilation of WIMP dark matter in the halo of our own Milky-Way Galaxy with high resolution $N$-body simulations of a Milky-Way like dark matter halo, assuming different nature of WIMPs. Due to the large free-streaming length in the scenario of warm WIMPs, the substructure contend of the dark matter halo is significantly different from that of the cold WIMP counterpart, resulting in distinct predictions of the $\gamma$-ray signals from the dark matter annihilation. We illustrate these by comparing the predicted $\gamma$-ray signals from the warm WIMP annihilation to that of cold WIMPs. Pronounced differences from the subhalo skymap and statistical properties between two WIMP models are demonstrated. Due to the potentially enhanced cross section of the non-thermal production mechanism in warm WIMP scenario, the Galactic center might be prior for the indirect detection of warm WIMPs to dwarf galaxies, which might be different from the cold dark matter scenario. As a specific example we consider the non-thermally produced neutralino of supersymmetric model and discuss the detectability of warm WIMPs with Fermi $\gamma$-ray telescope.

12 pages, 10 figures and 1 table; accepted by Phys. Rev. D

References in corpus (67)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• A Universal Density Profile from Hierarchical Clustering
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Particle Dark Matter: Evidence, Candidates and Constraints
• Efficient Computation of CMB anisotropies in closed FRW models
• Supersymmetric Dark Matter
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Observation of an anomalous positron abundance in the cosmic radiation
• Cosmic strings
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• Halo Formation in Warm Dark Matter Models
• Propagation of cosmic-ray nucleons in the Galaxy
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• PAMELA Measurements of Cosmic-ray Proton and Helium Spectra
• Clumps and streams in the local dark matter distribution
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• SuSpect: a Fortran Code for the Supersymmetric and Higgs Particle Spectrum in the MSSM
• Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope
• Dark Matter Results from 100 Live Days of XENON100 Data
• micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model
• Dark matter direct detection rate in a generic model with micrOMEGAs2.2
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• The energy spectrum of cosmic-ray electrons at TeV energies
• Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope
• 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
• A novel determination of the local dark matter density
• Earth-mass dark-matter haloes as the first structures in the early Universe
• Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions
• Substructure and halo density profiles in a Warm Dark Matter Cosmology
• The haloes of bright satellite galaxies in a warm dark matter universe
• The dark matter density at the Sun's location
• Discrepant hardening observed in cosmic-ray elemental spectra
• Energy Spectra of Abundant Nuclei of Primary Cosmic Rays from the Data of ATIC-2 Experiment: Final Results
• Constraints on cosmic-ray propagation models from a global Bayesian analysis
• Exclusion of canonical WIMPs by the joint analysis of Milky Way dwarfs with Fermi
• Observations of Milky Way Dwarf Spheroidal galaxies with the Fermi-LAT detector and constraints on Dark Matter models
• Direct, Indirect and Collider Detection of Neutralino Dark Matter In SUSY Models with Non-universal Higgs Masses
• Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy
• Damping scales of neutralino cold dark matter
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• Formation of Disk Galaxies: Warm Dark Matter and the Angular Momentum problem
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Exploration of the MSSM with Non-Universal Higgs Masses
• Discreteness effects in simulations of Hot/Warm dark matter
• Topological Defects and Structure Formation
• Constraints on Dark Matter Annihilation in Clusters of Galaxies with the Fermi Large Area Telescope
• Constraints on Cosmological Dark Matter Annihilation from the Fermi-LAT Isotropic Diffuse Gamma-Ray Measurement
• Realistic sterile neutrino dark matter with keV mass does not contradict cosmological bounds
• Non-Thermal Production of WIMPs and the Sub-Galactic Structure of the Universe
• Dark Matter from Early Decays
• SuperWIMP Solutions to Small Scale Structure Problems
• Non-thermal dark matter via Affleck-Dine baryogenesis and its detection possibility
• The rotation curves of dwarf galaxies: a problem for Cold Dark Matter?
• Systematic uncertainties in the determination of the local dark matter density
• The statistics of the subhalo abundance of dark matter haloes
• Non-thermal Production of Neutralino Cold Dark Matter from Cosmic String Decays
• CosRayMC: a global fitting method in studying the properties of the new sources of cosmic e${}^{\pm }$ excesses
• Non-Thermal Production of WIMPs, Cosmic $e^{\pm }$ Excesses and $\gamma$-rays from the Galactic Center
• Non-Thermal Dark Matter from Cosmic Strings
• Fermionic partner of Quintessence field as candidate for dark matter
• A Mechanism for Baryogenesis in Low Energy Supersymmetry Breaking Models
• Galactic diffuse gamma rays --- recalculation based on the new measurements of cosmic electron spectrum

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