Influence of the deviation of the matter power spectrum at small scales on the global 21-cm signal at cosmic dawn

Abstract

The matter power spectrum has been strongly constrained by astronomical measurements at large scales, but only weakly at small scales. Compared with the standard scenario, the deviation of the matter power spectrum at small scales has influence on the cosmological structure formation, e.g., the comoving number density of dark matter halos. The thermal history of the intergalactic medium (IGM) can be changed if dark matter is made of weakly interacting massive particles and can annihilate into standard model particles. The changes of the evolution of IGM could leave imprints on the relevant astronomical observations. Taking into account the dark matter annihilation, we investigate the impact of the deviation of matter power spectrum at small scales on the global 21-cm signal. In view of the measurements of the global 21-cm signal by the EDGES experiment, we explore the allowed parameter space of $m_s$, which describes the degree of deviation, by requiring the differential brightness temperature of the global 21-cm signal $\delta T_{21}\le -50\mathrm{mK}$ at redshift $z=17$.

9 npages, 4 figures. comments welcome. Added some references

References in corpus (28)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Generalised constraints on the curvature perturbation from primordial black holes
• Contraints on radiative dark-matter decay from the cosmic microwave background
• Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Silk damping at a redshift of a billion: a new limit on small-scale adiabatic perturbations
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• Multimessenger constraints on the dark matter interpretation of the Fermi-LAT Galactic center excess
• Primordial black holes and secondary gravitational waves from inflationary model with a non-canonical kinetic term
• Constraining DM through 21 cm observations
• The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
• The nature of dark matter from the global high redshift HI 21 cm signal
• Results from EDGES High-Band: III. New Constraints on Parameters of the Early Universe
• Lyman-$\alpha$ coupling and heating at Cosmic Dawn
• Impact of the Primordial Stellar Initial Mass Function on the 21-cm Signal
• Primordial black holes ensued from exponential potential and coupling parameter in nonminimal derivative inflation model
• Measuring the growth of structure with intensity mapping surveys
• Bounds on abundance of primordial black hole and dark matter from EDGES 21-cm signal
• Enhanced power on small scales and evolution of quantum state of perturbations in single and two field inflationary models
• Constraints on primordial black holes and curvature perturbations from the global 21cm signal
• Constraints on Primordial Power Spectrum from Galaxy Luminosity Functions
• Systematic uncertainties in models of the cosmic dawn
• Constraints on the basic parameters of dark matter using the Planck data
• Impacts of new small-scale N-body simulations on dark matter annihilations constrained from cosmological 21cm line observations
• Constraints on the small scale curvature perturbation using Planck-2015 data
• Rapid onset of the 21-cm signal suggests a preferred mass range for dark matter particle
• Tau neutrinos from ultracompact dark matter minihalos and constraints on the primordial curvature perturbations
• Probing isocurvature perturbations with 21-cm global signal in the light of HERA result