A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA

Abstract

We consider a decaying scalar dark matter (DM) with mass $m_{\chi }$ in the range 10 GeV - 10 TeV and vary the branching ratios of all possible two-body SM final states (excluding and including $\nu \bar{\nu }$) in the range $0\%-100\%$ to derive constraints on the total decay width $\Gamma$ using the data collected by several astrophysical and cosmological observations. We find that, $\Gamma \lesssim 10^{-26}-10^{-27}{\mathrm{s}}^{-1}$ (excluding $\nu \bar{\nu }$) and $\Gamma \lesssim 10^{-24}-10^{-26}{\mathrm{s}}^{-1}$ (including $\nu \bar{\nu }$) are allowed, depending on the values of $m_{\chi }$, which are most robust upper limits on $\Gamma$ for a generic decaying scalar DM. We then investigate the prospect of the upcoming Square Kilometre Array (SKA) radio telescope in detecting the DM decay induced radio signals originating inside the dwarf spheroidal (dSph) galaxies. We have classified the DM parameter space, allowed by the existing observations, independently of the branching ratio of each individual two-body SM final state, based on the detectability at the SKA. Excluding the $\nu \bar{\nu }$ decay mode, we find that, throughout the DM mass range considered, $\Gamma \gtrsim 10^{-30}{\mathrm{s}}^{-1}-10^{-29}{\mathrm{s}}^{-1}$ is detectable for all possible branching ratio combinations at the SKA (assuming 100 hours of observation time), with conservative choices for the relevant astrophysical parameters. On the other hand, when arbitrary branching ratios are allowed also for the $\nu \bar{\nu }$ decay mode, DM decays can be probed independently of the branching ratio of each SM final state for $\Gamma \gtrsim 2\times 10^{-29}{\mathrm{s}}^{-1}$, provided DM masses are greater than a few hundreds of GeV.

arXiv comment46 pages, 12 figures, 1 table; text modified, figures and table added; current version matches with the version accepted in JCAP

References in corpus (124)

• Planck 2015 results. XIII. Cosmological parameters
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The Structure of Cold Dark Matter Halos
• Supersymmetric Dark Matter
• Dwarf Galaxies of the Local Group
• Observation of an anomalous positron abundance in the cosmic radiation
• Cosmic-ray propagation and interactions in the Galaxy
• Freeze-In Production of FIMP Dark Matter
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
• Symmetries and Strings in Field Theory and Gravity
• The Waning of the WIMP? A Review of Models, Searches, and Constraints
• Rotation Curves of Spiral Galaxies
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• EGRET Observations of the Extragalactic Gamma Ray Emission
• A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
• The SIMP Miracle
• WIMP dark matter candidates and searches - current status and future prospects
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• A common mass scale for satellite galaxies of the Milky Way
• Diffuse Galactic continuum gamma rays. A model compatible with EGRET data and cosmic-ray measurements
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• On the local dark matter density
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Gravitino Dark Matter in R-Parity Breaking Vacua
• A Complete Spectroscopic Survey of the Milky Way Satellite Segue 1: The Darkest Galaxy
• General Constraints on Dark Matter Decay from the Cosmic Microwave Background
• New limits on dark matter annihilation from AMS cosmic ray positron data
• Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
• Gravitino Dark Matter without R-parity
• Multi-frequency analysis of neutralino dark matter annihilations in the Coma cluster
• Decaying Dark Matter can explain the electron/positron excesses
• Giant Magnetized Outflows from the Centre of the Milky Way
• Constraints on symmetry from holography
• The Least Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1
• Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
• Dwarf galaxy annihilation and decay emission profiles for dark matter experiments
• GeV-Scale Thermal WIMPs: Not Even Slightly Dead
• Precise constraints on the dark matter content of Milky Way dwarf galaxies for gamma-ray experiments
• Elastically Decoupling Dark Matter
• Dark Matter distribution in the Milky Way: microlensing and dynamical constraints
• The interstellar cosmic-ray electron spectrum from synchrotron radiation and direct measurements
• Dark matter annihilations and decays after the AMS-02 positron measurements
• Gamma-ray Constraints on Decaying Dark Matter and Implications for IceCube
• The Most Dark Matter Dominated Galaxies: Predicted Gamma-ray Signals from the Faintest Milky Way Dwarfs
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• Gamma Ray Spectrum from Gravitino Dark Matter Decay
• Astrophysical Probes of Unification
• Gamma ray constraints on Decaying Dark Matter
• Constraints on the Galactic Population of TEV Pulsar Wind Nebulae Using Fermi Large Area Telescope Observations
• Impact of stochastic gas motions on galaxy cluster abundance profiles
• Novel cosmic-ray electron and positron constraints on MeV dark matter particles
• Dark Matter and Global Symmetries
• Indirect Searches for Decaying Dark Matter
• Gamma-Rays from Decaying Dark Matter
• LHC-friendly minimal freeze-in models
• Searches for Dark Matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
• Search for neutrinos from decaying dark matter with IceCube
• A Predictive Analytic Model for the Solar Modulation of Cosmic Rays
• Dual MeV Gamma-Ray and Dark Matter Observatory -- GRAMS Project
• Effect of turbulent diffusion on iron abundance profiles
• Indirect Detection of Dark Matter Using MeV-Range Gamma-Ray Telescopes
• Constraints on decaying dark matter from the extragalactic gamma-ray background
• Strong Evidence for Gamma-ray Line Emission from the Inner Galaxy
• Constraints on Decaying Dark Matter from the Isotropic Gamma-Ray Background
• Neutrino Signals from Dark Matter Decay
• Probing the scotogenic FIMP at the LHC
• New Limits on the Dark Matter Lifetime from Dwarf Spheroidal Galaxies using Fermi-LAT
• A Pair Production Telescope for Medium-Energy Gamma-Ray Polarimetry
• Phenomenology of ELDER Dark Matter
• Axinos as Dark Matter Particles
• Freeze-in production of decaying dark matter in five steps
• Scalar sector properties of two-Higgs-doublet models with a global U(1) symmetry
• The Advanced Compton Telescope Mission
• Secondary antiprotons as a Galactic Dark Matter probe
• Searching for Dark Matter with X-ray Observations of Local Dwarf Galaxies
• GRIPS - Gamma-Ray Imaging, Polarimetry and Spectroscopy
• Probing heavy dark matter decays with multi-messenger astrophysical data
• Dark matter in the Reticulum II dSph: a radio search
• Hunting for super-heavy dark matter with the highest-energy cosmic rays
• A Clockwork WIMP
• Moduli dark matter and the search for its decay line using Suzaku X-ray telescope
• Simplified SIMPs and the LHC
• Local Group dSph radio survey with ATCA (II): Non-thermal diffuse emission
• Local Group dSph radio survey with ATCA (III): Constraints on Particle Dark Matter
• Searching for Dark Matter in the Galactic Halo with a Wide Field of View TeV Gamma-ray Observatory in the Southern Hemisphere
• Direct constraints on diffusion models from cosmic-ray positron data: Excluding the Minimal model for dark matter searches
• Constraints on leptophilic dark matter from the AMS-02 experiment
• Multiwavelength Analysis of Dark Matter Annihilation and RX-DMFIT
• Radiatively decaying scalar dark matter through U(1) mixings and the Fermi 130 GeV gamma-ray line
• 130 GeV Fermi gamma-ray line from dark matter decay
• Bounds on Dark Matter Properties from Radio Observations of Ursa Major II using the Green Bank Telescope
• Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background
• Indirect Search for Dark Matter from the Galactic Center and Halo with the Super-Kamiokande Detector
• Gamma-Ray Lines from Radiative Dark Matter Decay
• Synchrotron Emission from Dark Matter Annihilation: Predictions for Constraints from Non-detections of Galaxy Clusters with New Radio Surveys
• 21-cm signature of the first sources in the Universe: Prospects of detection with SKA
• Cosmic-Ray Positrons Strongly Constrain Leptophilic Dark Matter
• Right-chiral sneutrinos and long-lived staus: event characteristics at the Large Hadron Collider
• Reionization and dark matter decay
• A Multi-frequency analysis of dark matter annihilation interpretations of recent anti-particle and gamma-ray excesses in cosmic structures
• Axino dark matter with R-parity violation and 130 GeV gamma-ray line
• Constraints on MeV dark matter and primordial black holes: Inverse Compton signals at the SKA
• Dark matter decay through gravity portals
• Decaying Asymmetric Dark Matter Relaxes the AMS-Fermi Tension
• Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations
• Heavy dark matter particle annihilation in dwarf spheroidal galaxies: radio signals at the SKA telescope
• Limits on the Dark Matter from AMS-02 antiproton and positron fraction data
• Updated galactic radio constraints on Dark Matter
• Can SKA--Phase 1 go much beyond the LHC in supersymmetry search?
• Right sneutrinos and the signals of a stable stop at the Large Hadron Collider
• Sensitivity of SKA to dark matter induced radio emission
• Neutrino lines from DM decay induced by high-scale seesaw interactions
• A Froggatt-Nielsen Model for Leptophilic Scalar Dark Matter Decay
• Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies
• Gamma-ray signals from multicomponent scalar dark matter decays
• Decaying WIMP dark matter for AMS-02 cosmic positron excess
• The Cosmic-Ray Positron and Electron Excess: An Experimentalist's Point of View
• Search for decaying heavy dark matter in an effective interaction framework: a comparison of $\gamma$-ray and radio observations
• Baryogenesis and Asymmetric Dark Matter from The Left-Right Mirror Symmetric Model

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• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Superhorizon entanglement from inflationary particle production
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• Strong Constraints on Dark Photon and Scalar Dark Matter Decay from INTEGRAL and AMS-02 data
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