The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background

Abstract

The radiation background produced by the 21 cm spin-flip transition of neutral hydrogen at high redshifts can be a pristine probe of fundamental physics and cosmology. At z~30-300, the intergalactic medium (IGM) is visible in 21 cm absorption against the cosmic microwave background (CMB), with a strength that depends on the thermal (and ionization) history of the IGM. Here we examine the constraints this background can place on dark matter decay and annihilation, which could heat and ionize the IGM through the production of high-energy particles. Using a simple model for dark matter decay, we show that, if the decay energy is immediately injected into the IGM, the 21 cm background can detect energy injection rates >10^{-24} eV cm^{-3} sec^{-1}. If all the dark matter is subject to decay, this allows us to constrain dark matter lifetimes <10^{27} sec. Such energy injection rates are much smaller than those typically probed by the CMB power spectra. The expected brightness temperature fluctuations at z~50 are a fraction of a mK and can vary from the standard calculation by up to an order of magnitude, although the difference can be significantly smaller if some of the decay products free stream to lower redshifts. For self-annihilating dark matter, the fluctuation amplitude can differ by a factor <2 from the standard calculation at z~50. Note also that, in contrast to the CMB, the 21 cm probe is sensitive to both the ionization fraction and the IGM temperature, in principle allowing better constraints on the decay process and heating history. We also show that strong IGM heating and ionization can lead to an enhanced H_2 abundance, which may affect the earliest generations of stars and galaxies.

arXiv commentsubmitted to Phys Rev D, 14 pages, 8 figures

References in corpus (39)

• Particle Dark Matter: Evidence, Candidates and Constraints
• The Formation of the First Star in the Universe
• The Formation of the First Stars. I. The Primordial Star Forming Cloud
• How small were the first cosmological objects?
• Structure of Stationary Photodissociation Fronts
• A New Calculation of the Recombination Epoch
• The Cosmic Infrared Background Resolved by Spitzer. Contributions of Mid-Infrared Galaxies to the Far-Infrared Background
• MeV Dark Matter: Has It Been Detected?
• Particle decays during the cosmic dark ages
• Second-Generation Objects in the Universe: Radiative Cooling and Collapse of Halos with Virial Temperatures Above 10^4 Kelvin
• Ultra-high energy cosmic rays without GZK cutoff
• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations Through 21 cm Tomography Prior to the Epoch of Structure Formation
• Detecting Dark Matter Annihilation with CMB Polarization : Signatures and Experimental Prospects
• The Global 21 Centimeter Background from High Redshifts
• Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
• The Spin-Kinetic Temperature Coupling and the Heating Rate due to Lyman Alpha Scattering before Reionization: Predictions for 21cm Emission and Absorption
• A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations
• Fossil HII Regions: Self-Limiting Star Formation at High Redshift
• The CMBR fluctuations from HI perturbations prior to reionization
• Extremely high energy cosmic rays from relic particle decays
• Impact of dark matter decays and annihilations on reionization
• Relic keV sterile neutrinos and reionization
• H_2 Cooling of Primordial Gas Triggered by UV Irradiation
• Descending from on high: Lyman series cascades and spin-kinetic temperature coupling in the 21 cm line
• Do We Need Stars to Reionize the Universe at High Redshifts? Early Reionization by Decaying Heavy Sterile Neutrinos
• Possible Evidence For Axino Dark Matter In The Galactic Bulge
• Growth of Linear Perturbations before the Era of the First Galaxies
• Decaying particles and the reionization history of the Universe
• Probing the Epoch of Early Baryonic Infall Through 21cm Fluctuations
• Ionization history of the cosmic plasma in the light of the recent CBI and future PLANCK data
• Recognizing the First Radiation Sources Through Their 21-cm Signature
• Spectral distortions to the Cosmic Microwave Background from the recombination of hydrogen and helium
• Dark Matter and the CACTUS Gamma-Ray Excess from Draco
• Recombining WMAP: constraints on ionizing and resonance radiation at recombination
• Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB
• History of Hydrogen Reionization in the Cold Dark Matter Model
• Ionization history of the Universe as a test for Super Heavy Dark Matter particles
• Scaling defect decay and the reionization history of the Universe
• Early reionization by decaying particles and cosmic microwave background radiation

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