Enhanced n-body annihilation of dark matter and its indirect signatures

Abstract

We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process. We point out that such processes can be strongly enhanced at low velocities without violating unitarity, similar to Sommerfeld enhancement in the standard case of two-body annihilation, potentially leading to visible signals in indirect searches. We study in detail the impact of such multi-body annihilations on the ionization history of the universe and consequently the cosmic microwave background, and find that unlike in the two-body case, the dominant signal can naturally arise from the end of the cosmic dark ages, after the onset of structure formation. We examine the complementary constraints from the Galactic Center, Galactic halo, and galaxy clusters, and outline the circumstances under which each search would give rise to the strongest constraints. We also show that if there is a population of ultra-compact dense dark matter clumps present in the Milky Way with sufficiently steep density profile, then it might be possible to detect point sources illuminated by multi-body annihilation, even if there is no large low-velocity enhancement. Finally, we provide a case study of a model where 3-body annihilation dominates the freezeout process, and in particular the resonant regime where a large low-velocity enhancement is naturally generated.

arXiv comment61 pages, 16 figures

References in corpus (108)

• A Universal Density Profile from Hierarchical Clustering
• Efficient Computation of CMB anisotropies in closed FRW models
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Baryonic Features in the Matter Transfer Function
• The Aquarius Project: the subhalos of galactic halos
• Cold and Fuzzy Dark Matter
• Universality in Few-body Systems with Large Scattering Length
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• Dark Matter Self-interactions and Small Scale Structure
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• The Dark Side of the Halo Occupation Distribution
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• Warm Dark Matter as a solution to the small scale crisis: new constraints from high redshift Lyman-alpha forest data
• Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters
• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster
• Halo concentrations in the standard LCDM cosmology
• The SIMP Miracle
• Cosmology and Astrophysics of Minimal Dark Matter
• Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
• New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data
• Diffuse Galactic continuum gamma rays. A model compatible with EGRET data and cosmic-ray measurements
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• The redshift dependence of the structure of massive LCDM halos
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck
• First constraints on fuzzy dark matter from Lyman-$\alpha$ forest data and hydrodynamical simulations
• Explosive Dark Matter Annihilation
• The Chandra COSMOS Survey, I: Overview and Point Source Catalog
• Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
• The Spectrum of Diffuse Cosmic Hard X-Rays Measured with HEAO-1
• The SIMPlest Miracle
• The Dark Matter Halo of the Milky Way, AD 2013
• Detection of Extended He II Reionization in the Temperature Evolution of the Intergalactic Medium
• CMB constraints on Dark Matter models with large annihilation cross-section
• Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray Observations
• The first WIMPy halos
• The radial velocity dispersion profile of the Galactic halo: Constraining the density profile of the dark halo of the Milky Way
• Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
• General Constraints on Dark Matter Decay from the Cosmic Microwave Background
• Probing Light Thermal Dark-Matter With a Higgs Portal Mediator
• Indirect Dark Matter Signatures in the Cosmic Dark Ages II. Ionization, Heating and Photon Production from Arbitrary Energy Injections
• Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos
• Breit-Wigner Enhancement of Dark Matter Annihilation
• Survival of Substructure within Dark Matter Haloes
• The flattening of the concentration-mass relation towards low halo masses and its implications for the annihilation signal boost
• Searching for Dark Matter in the CMB: A Compact Parameterization of Energy Injection from New Physics
• Halo Mass Function and the Free Streaming Scale
• Current Dark Matter Annihilation Constraints from CMB and Low-Redshift Data
• Elastically Decoupling Dark Matter
• Growth of structure seeded by primordial black holes
• SIMP Spectroscopy
• Tying Dark Matter to Baryons with Self-interactions
• A New Probe of Dark Matter and High-Energy Universe Using Microlensing
• The Observed Concentration-Mass Relation for Galaxy Clusters
• Efimov Physics in Cold Atoms
• Cannibal Dark Matter
• Energy Injection And Absorption In The Cosmic Dark Ages
• (Almost) Closing the $\nu$MSM Sterile Neutrino Dark Matter Window with NuSTAR
• Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter
• Lifetime of the Bose Gas with Resonant Interactions
• The Clumpiness of Cold Dark Matter: Implications for the Annihilation Signal
• Too Hot, Too Cold or Just Right? Implications of a 21-cm Signal for Dark Matter Annihilation and Decay
• Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6
• SIMPs through the axion portal
• INTEGRAL SPI All-Sky View in Soft Gamma Rays: Study of Point Source and Galactic Diffuse Emissions
• The Substructure Hierarchy in Dark Matter Haloes
• Dark matter searches with Cherenkov telescopes: nearby dwarf galaxies or local galaxy clusters?
• Bondi accretion in the early universe
• XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
• Stability of a unitary Bose gas
• Dark Forces and Light Dark Matter
• Communication with SIMP dark mesons via Z'-portal
• The statistics of the subhalo abundance of dark matter haloes
• Constraining dark matter late-time energy injection: decays and p-wave annihilations
• Self-consistent Calculation of the Sommerfeld Enhancement
• Constraining DM through 21 cm observations
• WIMP and SIMP Dark Matter from the Spontaneous Breaking of a Global Group
• Simply split SIMPs
• A first direct measurement of the intergalactic medium temperature around a quasar at z=6
• The Mismeasure of Mergers: Revised Limits on Self-interacting Dark Matter in Merging Galaxy Clusters
• Cosmic abundances of SIMP dark matter
• Are ultracompact minihalos really ultracompact?
• Phenomenology of ELDER Dark Matter
• SIMP model at NNLO in chiral perturbation theory
• Enabling Forbidden Dark Matter
• The nature of dark matter from the global high redshift HI 21 cm signal
• An X-ray Spectroscopic Search for Dark Matter in the Perseus Cluster with Suzaku
• A Search for Dark Matter Annihilation in Galaxy Groups
• Secondary Infall and the Pseudo-Phase-Space Density Profiles of Cold Dark Matter Halos
• Resonant SIMP dark matter
• A general theoretical description of N-body recombination
• Resolving Small-Scale Dark Matter Structures Using Multi-Source Indirect Detection
• Vector SIMP dark matter
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Caustics in growing Cold Dark Matter Haloes
• Sommerfeld-Enhanced $J$-Factors For Dwarf Spheroidal Galaxies
• Light Dark Matter through Assisted Annihilation
• Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
• A Search for Dark Matter Annihilation in the Milky Way Halo
• Constraining self-interacting dark matter with scaling laws of observed halo surface densities
• Production of dark-matter bound states in the early universe by three-body recombination
• Processes with the $t$-channel singularity in the physical region: finite beam sizes make cross sections finite
• A Radiative Neutrino Mass Model with SIMP Dark Matter
• Known Unknowns of Dark Matter Annihilation over Cosmic Time
• Dark Spectroscopy
• Singular Cross Sections in Muon Colliders

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• Unitarity limits on thermal dark matter in (non-)standard cosmologies
• Cosmological Constraints on Dark Scalar
• An Asymmetric SIMP Dark Matter Model
• Perturbative Unitarity of Strongly Interacting Massive Particle Models
• Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
• Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter
• Models for Self-resonant Dark Matter
• Reshuffled Strongly Interacting Massive Particle Dark Matter
• MeV scale model of SIMP dark matter, neutrino mass and leptogenesis