21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
arXiv:2502.08719 · doi:10.1103/6rkn-tlrh
Abstract
Although it is commonly assumed that relativistic particles dominate the energy density of the universe quickly after inflation, a variety of well-motivated scenarios predict an early matter-dominated era (EMDE) before the onset of Big Bang nucleosynthesis. Subhorizon dark matter density perturbations grow faster during an EMDE than during a radiation-dominated era, leading to the formation of "microhalos" far earlier than in standard models of structure formation. This enhancement of small-scale structure boosts the dark-matter annihilation rate, which contributes to the heating of the intergalactic medium (IGM). We compute how the dark matter annihilation rate evolves after an EMDE and forecast how well measurements of the 21-cm background can detect dark matter annihilation in cosmologies with EMDEs. We find that future measurements of the global 21-cm signal at a redshift of are unlikely to improve on bounds derived from observations of the isotropic gamma-ray background, but measurements of the 21-cm power spectrum have the potential to detect dark matter annihilation following an EMDE. Moreover, dark matter annihilation and astrophysical X-rays produce distinct heating signatures in the 21-cm power spectrum at redshifts around 14, potentially allowing differentiation between these two IGM heating mechanisms.
arXiv comment18 pages, 9 figures; minor additions made to match version published in PRD
References in corpus (113)
- A Universal Density Profile from Hierarchical Clustering
- The Structure of Cold Dark Matter Halos
- The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
- Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
- Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
- An absorption profile centred at 78 megahertz in the sky-averaged spectrum
- 21-cm cosmology
- Small Scale Cosmological Perturbations: An Analytic Approach
- Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
- The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
- PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
- 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
- Possible interaction between baryons and dark-matter particles revealed by the first stars
- What is the lowest possible reheating temperature?
- CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
- 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
- Particle decays during the cosmic dark ages
- Cosmological Constraints on Late-time Entropy Production
- Radiation Backgrounds at Cosmic Dawn: X-Rays from Compact Binaries
- MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles
- A Per-Baseline, Delay-Spectrum Technique for Accessing the 21cm Cosmic Reionization Signature
- Bounds on very low reheating scenarios after Planck
- Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at from LOFAR
- Insights on Dark Matter from Hydrogen during Cosmic Dawn
- Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
- Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
- HyRec: A fast and highly accurate primordial hydrogen and helium recombination code
- The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
- Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn
- Indirect Dark Matter Signatures in the Cosmic Dark Ages II. Ionization, Heating and Photon Production from Arbitrary Energy Injections
- Cosmological constraints on exotic injection of electromagnetic energy
- Concerns about Modelling of the EDGES Data
- Effects of cold dark matter decoupling and pair annihilation on cosmological perturbations
- The Epoch of Reionization Window: II. Statistical Methods for Foreground Wedge Reduction
- The oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature
- Charting the Parameter Space of the Global 21-cm Signal
- Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
- Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems
- Cosmological Moduli and the Post-Inflationary Universe: A Critical Review
- HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
- Probing the Dark Ages at Z~20: The SCI-HI 21 cm All-Sky Spectrum Experiment
- The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
- Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
- The Darkest Hour Before Dawn: Contributions to Cosmic Reionization from Dark Matter Annihilation and Decay
- Reheating Effects in the Matter Power Spectrum and Implications for Substructure
- Energy Injection And Absorption In The Cosmic Dark Ages
- The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
- 21cm Limits on Decaying Dark Matter and Primordial Black Holes
- BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal
- A Ground Plane Artifact that Induces an Absorption Profile in Averaged Spectra from Global 21-cm Measurements - with Possible Application to EDGES
- Too Hot, Too Cold or Just Right? Implications of a 21-cm Signal for Dark Matter Annihilation and Decay
- Towards a complete treatment of the cosmological recombination problem
- The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
- Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
- The Impact of the First Galaxies on Cosmic Dawn and Reionization
- Bounds on Dark Matter annihilations from 21 cm data
- The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
- Density Profiles of CDM Microhalos and their Implications for Annihilation Boost Factors
- 21-cm Fluctuations from Charged Dark Matter
- Gamma-ray Signal from Earth-mass Dark Matter Microhalos
- Non-thermal Histories and Implications for Structure Formation
- The Dark Matter Annihilation Boost from Low-Temperature Reheating
- Reionization after JWST: a photon budget crisis?
- Constraints on Decaying Dark Matter from the Isotropic Gamma-Ray Background
- Constraining DM through 21 cm observations
- DarkHistory: A code package for calculating modified cosmic ionization and thermal histories with dark matter and other exotic energy injections
- Earth-mass haloes and the emergence of NFW density profiles
- Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum
- Are ultracompact minihalos really ultracompact?
- Unveiling the nature of dark matter with high redshift 21 cm line experiments
- How Dark Matter Reionized The Universe
- The 21 cm signal and the interplay between dark matter annihilations and astrophysical processes
- Breaking degeneracies in the first galaxies with clustering
- Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
- SARAS 3 CD/EoR Radiometer: Design and Performance of the Receiver
- Inner cusps of the first dark matter haloes: Formation and survival in a cosmological context
- Structure Formation during an early period of matter domination
- An Effective Model for the Cosmic-Dawn 21-cm Signal
- Can Early Dark Energy Explain EDGES?
- The Abundance and Structure of Subhaloes near the Free Streaming Scale and Their Impact on Indirect Dark Matter Searches
- Predicting the density profiles of the first halos
- Annihilation Signatures of Hidden Sector Dark Matter Within Early-Forming Microhalos
- Growth of Dark Matter Perturbations during Kination
- Fingerprints of the initial conditions on the density profiles of cold and warm dark matter haloes
- Breaking a dark degeneracy: The gamma-ray signature of early matter domination
- Dynamical Evolution of Primordial Dark Matter Haloes through Mergers
- Long-lived Light Mediator to Dark Matter and Primordial Small Scale Spectrum
- Bringing Isolated Dark Matter Out of Isolation: Late-time Reheating and Indirect Detection
- Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background
- Phase-space structure of protohalos: Vlasov versus Particle-Mesh
- Evolution of dark matter microhalos through stellar encounters
- Tidal evolution of dark matter annihilation rates in subhalos
- Cannibal domination and the matter power spectrum
- Informing antenna design for sky-averaged 21-cm experiments using a simulated Bayesian data analysis pipeline
- Constraining Nonthermal Dark Matter's Impact on the Matter Power Spectrum
- Prompt cusps and the dark matter annihilation signal
- Lensing constraints on ultradense dark matter halos
- 21cm signal sensitivity to dark matter decay
- Cannibalism's lingering imprint on the matter power spectrum
- Quasidecoupled state for dark matter in nonstandard thermal histories
- Major mergers between dark matter haloes -- II. Profile and concentration changes
- The effect of stellar encounters on the dark matter annihilation signal from prompt cusps
- The First Billion Years in Seconds: An Effective Model for the 21-cm Signal with Population III Stars
- Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys
- Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
- The Effects Of Relativistic Hidden Sector Particles on the Matter Power Spectrum
- Dark Matter annihilation energy output and its effects on the high-z IGM
- Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
- How an era of kination impacts substructure and the dark matter annihilation rate
- Simulations of Gravitational Heating Due to Early Matter Domination
- The Effects of Dark Matter Annihilation on Cosmic Reionization
- Constraining the 21cm brightness temperature of the IGM at =6.6 around LAEs with the Murchison Widefield Array
- Limits on Early Matter Domination from the Isotropic Gamma-Ray Background