Can the WIMP annihilation boost factor be boosted by the Sommerfeld enhancement?

Abstract

We demonstrate that the Sommerfeld correction to CDM annihilations can be appreciable if even a small component of the dark matter is extremely cold. Subhalo substructure provides such a possibility given that the smallest clumps are relatively cold and contain even colder substructure due to incomplete phase space mixing. Leptonic channels can be enhanced for plausible models and the solar neighbourhood boost required to account for PAMELA/ATIC data is plausibly obtained, especially in the case of a few TeV mass neutralino for which the Sommerfeld-corrected boost is found to be $\sim 10^4-10^5.$ Saturation of the Sommerfeld effect is shown to occur below $\beta \sim 10^{-4},$ thereby constraining the range of contributing substructures to be above $\sim 10^5{\mathrm{M}}_{\odot }.$ We find that the associated diffuse gamma ray signal from annihilations would exceed EGRET constraints unless the channels annihilating to heavy quarks or to gauge bosons are suppressed. The lepton channel gamma rays are potentially detectable by the FERMI satellite, not from the inner galaxy where substructures are tidally disrupted, but rather as a quasi-isotropic background from the outer halo, unless the outer substructures are much less concentrated than the inner substructures and/or the CDM density profile out to the virial radius steepens significantly.

8 pages, 5 figures. References added. Replaced to match published version

References in corpus (17)

• The Aquarius Project: the subhalos of galactic halos
• A Theory of Dark Matter
• Cosmology and Astrophysics of Minimal Dark Matter
• 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
• The redshift dependence of the structure of massive LCDM halos
• The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
• New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• What mass are the smallest protohalos?
• Heavy Dark Matter Through the Higgs Portal
• Evidence Of Dark Matter Annihilations In The WMAP Haze
• TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter
• Conservative Constraints on Dark Matter Annihilation into Gamma Rays
• Early Annihilation and Diffuse Backgrounds in 1/v WIMP models

Cited by in corpus (128)

• Dark Matter Self-interactions and Small Scale Structure
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• CMB constraints on Dark Matter models with large annihilation cross-section
• Dark Matter Self-Interactions and Light Force Carriers
• Turning off the Lights: How Dark is Dark Matter?
• DarkSUSY 6 : An Advanced Tool to Compute Dark Matter Properties Numerically
• Dark Matter and Pulsar Origins of the Rising Cosmic Ray Positron Fraction in Light of New Data From AMS
• Sommerfeld enhancement: general results from field theory diagrams
• The Case for a 700+ GeV WIMP: Cosmic Ray Spectra from PAMELA, Fermi and ATIC
• Dark Matter and Fundamental Physics with the Cherenkov Telescope Array
• Inverse Compton constraints on the Dark Matter e+e- excesses
• MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• Relic densities including Sommerfeld enhancements in the MSSM
• Dark matter searches with Cherenkov telescopes: nearby dwarf galaxies or local galaxy clusters?
• Nonabelian dark matter: models and constraints
• Dark Matter Limits From Dwarf Spheroidal Galaxies with The HAWC Gamma-Ray Observatory
• Streams and caustics: the fine-grained structure of LCDM haloes
• Searches for Dark Matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
• H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
• VERITAS Deep Observations of the Dwarf Spheroidal Galaxy Segue 1
• High-Energy Neutrinos From Dark Matter Particle Self-Capture Within the Sun
• $e^{\pm }$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations
• Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement
• Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
• Consistent Scenarios for Cosmic-Ray Excesses from Sommerfeld-Enhanced Dark Matter Annihilation
• Small-scale clumps of dark matter
• A dark matter interpretation for the ARCADE excess?
• Exploring Dark Matter with Milky Way substructure
• Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates
• Investigating Gamma-Ray Lines from Dark Matter with Future Observatories
• Extracting limits on Dark Matter annihilation from gamma-ray observations towards dwarf spheroidal galaxies
• Constraining the origin of the rising cosmic ray positron fraction with the boron-to-carbon ratio
• The Effective Theory of Self-Interacting Dark Matter
• Upper Limits on the VHE gamma-ray Emission from the Willman 1 Satellite Galaxy with the MAGIC telescope
• Extragalactic gamma-ray background radiation from dark matter annihilation
• Cosmic ray lepton puzzle in the light of cosmological N-body simulations
• Caustics in growing Cold Dark Matter Haloes
• First star formation with dark matter annihilation
• Galactic PeV neutrinos from dark matter annihilation
• Enhancement of the annihilation of dark matter in a radiative seesaw model
• The Sensitivity of HAWC to High-Mass Dark Matter Annihilations
• A new twist on excited dark matter: implications for INTEGRAL, PAMELA/ATIC/PPB-BETS, DAMA
• Substructure Boosts to Dark Matter Annihilation from Sommerfeld Enhancement
• (Non-)thermal production of WIMPs during kination
• Dark matter and collider phenomenology of split-UED
• ATIC, PAMELA, HESS, Fermi and nearby Dark Matter subhalos
• Dark Matter Indirect Signatures
• Can multistate dark matter annihilation explain the high-energy cosmic ray lepton anomalies?
• Update on decaying and annihilating heavy dark matter with the 6-year IceCube HESE data
• Secondary radiation from the Pamela/ATIC excess and relevance for Fermi
• The cosmic X-ray and gamma-ray background from dark matter annihilation
• Metastable dark matter mechanisms for INTEGRAL 511 keV $\gamma$ rays and DAMA/CoGeNT events
• Light Higgs Boson, Light Dark Matter and Gamma Rays
• Sommerfeld enhancements with vector, scalar and pseudoscalar force-carriers
• Dark Matter Annihilation around Intermediate Mass Black Holes: an update
• The Fermi Gamma-Ray Haze from Dark Matter Annihilations and Anisotropic Diffusion
• The Dark Matter Annihilation Signal from Dwarf Galaxies and Subhalos
• Constraint on the velocity dependent dark matter annihilation cross section from Fermi-LAT observations of dwarf galaxies
• Constraining the Sommerfeld enhancement with Cherenkov telescope observations of dwarf galaxies
• Discriminating the source of high-energy positrons with AMS-02
• Cold Dark Matter in non-Standard Cosmologies, PAMELA, ATIC and Fermi LAT
• Signatures of clumpy dark matter in the global 21 cm background signal
• Updated Constraints on Self-Interacting Dark Matter from Supernova 1987A
• Enhancement of dark matter relic density from the late time dark matter conversions
• Weighing of the Dark Matter at the Center of the Galaxy
• Fermi-LAT Sensitivity to Dark Matter Annihilation in Via Lactea II Substructure
• A Sommerfeld Toolbox for Colored Dark Sectors
• Type II Seesaw and the PAMELA/ATIC Signals
• Continuum-Mediated Self-Interacting Dark Matter
• Search for Gamma-ray Spectral Lines from Dark Matter Annihilation up to 100 TeV towards the Galactic Center with MAGIC
• Exciting dark matter in the galactic center
• Constraints on Dark Matter Annihilation Cross Section in Scenarios of Brane-World and Quintessence
• Effects of Velocity-Dependent Dark Matter Annihilation on the Energy Spectrum of the Extragalactic Gamma-ray Background
• Leptons from Dark Matter Annihilation in Milky Way Subhalos
• Exploration of decaying dark matter in a left-right symmetric model
• Known Unknowns of Dark Matter Annihilation over Cosmic Time
• Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes
• Searches for dark matter subhaloes with wide-field Cherenkov telescope surveys
• Long-range self-interacting dark matter in the Sun
• Sommerfeld-Enhanced Annihilation in Dark Matter Substructure: Consequences for Constraints on Cosmic-Ray Excesses
• Gamma-ray signatures of annihilation to charged leptons in dark matter substructure
• Decaying Hidden Dark Matter in Warped Compactification
• The PAMELA and Fermi signals from long-lived Kaluza-Klein dark matter
• Can AMS-02 discriminate the origin of an anti-proton signal?
• Relic density and PAMELA events in a heavy wino dark matter model with Sommerfeld effect
• Cherenkov Telescope Array sensitivity to branon dark matter models
• Dark Matter Identification with Gamma Rays from Dwarf Galaxies
• Clumpiness enhancement of charged cosmic rays from dark matter annihilation with Sommerfeld effect
• Tracking Quintessence and Cold Dark Matter Candidates
• The Sommerfeld Enhancement in the Scotogenic Model with Large Electroweak Scalar Multiplets
• Effects of P-wave Annihilation on the Angular Power Spectrum of Extragalactic Gamma-rays from Dark Matter Annihilation
• Heating of galactic gas by dark matter annihilation in ultracompact minihalos
• Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies
• Sommerfeld enhancement for a Yukawa potential
• Extragalactic and galactic gamma-rays and neutrinos from annihilating dark matter
• Dark Stars and Boosted Dark Matter Annihilation Rates
• Searching for High Energy Neutrino counterpart signals; The case of the Fermi Bubbles signal and of Dark Matter annihilation in the inner Galaxy
• Classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation
• Self-annihilating dark matter and the CMB: reionizing the Universe and constraining cross sections
• Self-Interacting Dark Matter with Naturally Light Mediator
• CTA Sensitivity on TeV scale Dark Matter Models with Complementary Limits from Direct Detection
• Hidden sector effects on double higgs production near threshold at the LHC
• Neutrino forces and the Sommerfeld enhancement
• Constraints on Enhanced Dark Matter Annihilation from IceCube Results
• Probing annihilations and decays of low-mass galactic dark matter in IceCube DeepCore array: Track events
• Implication of the PAMELA antiproton data for dark matter indirect detection at LHC
• Cosmic positron and antiproton constraints on the gauge-Higgs Dark Matter
• Conservative upper limits on WIMP annihilation cross section from Fermi-LAT $\gamma$-rays
• Dark Matter Annihilation and the PAMELA, FERMI and ATIC Anomalies
• Dark Matter with Density-Dependent Interactions
• Multi-Sommerfeld enhancement in dark sector
• Enhancements to velocity-dependent dark matter interactions from tidal streams and shells in the Andromeda galaxy
• Gamma rays from Dark Matter Annihilation in Three-loop Radiative Neutrino Mass Generation Models
• On the use of X-ray and gamma-ray telescopes for identifying the origin of electrons and positrons observed by ATIC, Fermi, and PAMELA
• The Dark Matter Contribution to Galactic Diffuse Gamma Ray Emission
• Dark Matter Annihilation and Decay Searches with the High Altitude Water Cherenkov (HAWC) Observatory
• Numerical Simulations of the Dark Universe: State of the Art and the Next Decade
• Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $\gamma$-ray signals
• Gamma Rays from Annihilations at the Galactic Center in a Physical Dark Matter Distribution
• Consistent explanation for the cosmic-ray positron excess in p-wave Sommerfeld-enhanced dark matter annihilation
• Recent VERITAS Results
• Bounds to strong gravity from electron-positron annihilations near threshold
• SUSY Dark Matter in Universal and Nonuniversal Gaugino Mass Models
• Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies
• Final state interactions at the threshold of Higgs boson pair production
• Signatures of Dipolar Dark Matter on Indirect Detection