How Dark Matter Reionized The Universe

Abstract

Although empirical evidence indicates that that the universe's gas had become ionized by redshift z ~ 6, the mechanism by which this transition occurred remains unclear. In this article, we explore the possibility that dark matter annihilations may have played the dominant role in this process. Energetic electrons produced in these annihilations can scatter with the cosmic microwave background to generate relatively low energy gamma rays, which ionize and heat gas far more efficiently than higher energy prompt photons. In contrast to previous studies, we find that viable dark matter candidates with electroweak scale masses can naturally provide the dominant contribution to the reionization of the universe. Intriguingly, we find that dark matter candidates capable of producing the recent cosmic ray excesses observed by PAMELA and/or ATIC are also predicted to lead to the full reionization of the universe by z ~ 6.

10 pages, 6 figures; error in figure 2 corrected, conclusions unchanged

References in corpus (35)

• The Structure of Cold Dark Matter Halos
• Large scale bias and the peak background split
• Profiles of dark haloes: evolution, scatter, and environment
• High-Energy-Physics Event Generation with PYTHIA 6.1
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• A Theory of Dark Matter
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• Using the Evolution of Clusters to Constrain Omega
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Observational constraints on Cosmic Reionization
• Radiative Transfer in a Clumpy Universe: III. The Nature of Cosmological Ionizing Sources
• Wino Cold Dark Matter from Anomaly-Mediated SUSY Breaking
• Modelling Primordial Gas in Numerical Cosmology
• 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
• Reionization of the Universe and the Early Production of Metals
• Particle decays during the cosmic dark ages
• TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
• New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?
• Leptophilic Dark Matter
• A Universal Density Profile for Dark and Luminous Matter?
• Multi-Component Dark Matter
• Impact of dark matter decays and annihilations on reionization
• Dark matter interpretation of recent electron and positron data
• Contraints on radiative dark-matter decay from the cosmic microwave background
• An Effective Theory of Dirac Dark Matter
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• The Physics and Early History of the Intergalactic Medium
• The impact of dark matter decays and annihilations on the formation of the first structures
• Decaying particles and the reionization history of the Universe
• Intergalactic medium heating by dark matter
• The effect of early dark matter halos on reionization
• Impact of Dark Matter Annihilation on the High-Redshift Intergalactic Medium

Cited by in corpus (53)

• 21-cm cosmology
• The Evolution of the Intergalactic Medium
• Concordance models of reionization: implications for faint galaxies and escape fraction evolution
• Sommerfeld Enhancements for Thermal Relic Dark Matter
• Dark Matter Interpretations of the Electron/Positron Excesses after FERMI
• Asymmetric Dark Matter from a GeV Hidden Sector
• The Sommerfeld enhancement for dark matter with an excited state
• Galaxy UV-luminosity function and reionization constraints on axion dark matter
• The Darkest Hour Before Dawn: Contributions to Cosmic Reionization from Dark Matter Annihilation and Decay
• Energy Injection And Absorption In The Cosmic Dark Ages
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• Constraints on X-ray Emissions from the Reionization Era
• Robust implications on Dark Matter from the first FERMI sky gamma map
• Exotic energy injection with ExoCLASS: Application to the Higgs portal model and evaporating black holes
• Constraints on dark matter annihilation from CMB observations before Planck
• Constraining dark matter late-time energy injection: decays and p-wave annihilations
• Relative Role of Stars and Quasars in Cosmic Reionization
• Where do the AMS-02 anti-helium events come from?
• Consistent Scenarios for Cosmic-Ray Excesses from Sommerfeld-Enhanced Dark Matter Annihilation
• Effects of Dark Matter Annihilation on the Cosmic Microwave Background
• Status, Challenges and Directions in Indirect Dark Matter Searches
• Thermal Relics in Modified Cosmologies: Bounds on Evolution Histories of the Early Universe and Cosmological Boosts for PAMELA
• CMB photons shedding light on dark matter
• The 21 cm signal and the interplay between dark matter annihilations and astrophysical processes
• Implications of the Fermi-LAT diffuse gamma-ray measurements on annihilating or decaying Dark Matter
• Radio and gamma-ray constraints on dark matter annihilation in the Galactic center
• Distinguishing Dark Matter Annihilation Enhancement Scenarios via Halo Shapes
• Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
• Leptonic dark matter annihilation in the evolving universe: constraints and implications
• The Contribution Of Inverse Compton Scattering To The Diffuse Extragalactic Gamma-Ray Background From Annihilating Dark Matter
• Warm dark matter and the ionization history of the Universe
• CMB Constraint on Dark Matter Annihilation after Planck 2015
• Strong Optimized Conservative Fermi-LAT Constraints on Dark Matter Models from the Inclusive Photon Spectrum
• A closer look at CMB constraints on WIMP dark matter
• Distinguishing standard reionization from dark matter models
• Multi-messenger constraints on the annihilating dark matter interpretation of the positron excess
• Could Dark Matter Interactions be an Alternative to Dark Energy ?
• Redshifted intergalactic 3He+ 8.7 GHz hyperfine absorption
• Perturbed Recombination from Dark Matter Annihilation
• Heating and Ionization of the Primordial Intergalactic Medium by High Mass X-ray Binaries
• Aspects of Dark Matter Annihilation in Cosmology
• Was there an early reionization component in our universe?
• Cosmic reionization by primordial cosmic rays
• Coronae of Zero/Low-Metal Low-Mass Stars
• Resistive Heating Induced by Streaming Cosmic Rays Around a Galaxy in the Early Universe
• Self-annihilating dark matter and the CMB: reionizing the Universe and constraining cross sections
• The Effects of Dark Matter Annihilation on Cosmic Reionization
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Reionization history and CMB parameter estimation
• The Hydrogen Mixing Portal, Its Origins, and Its Cosmological Effects
• Cosmic microwave background constraints on the tensor-to-scalar ratio
• Constraints on Dark Matter annihilation and Its Equation of State after Planck Data
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos