The magnitude of the dark ages 21-cm signal in the context of existing early and late time constraints on $\Lambda$CDM

Abstract

The dark ages 21-cm signal is a promising probe of the currently unobserved infant universe between the formation of the Cosmic Microwave Background around $z\approx 1100$ and the first galaxies around $z\approx 30$. A detection of the signal will help researchers understanding the nature of dark matter and dark energy, the expansion of the universe and any extensions to the concordance $\Lambda$CDM model that could explain the reported Cosmic Dawn 21-cm signal from EDGES and the Hubble tension. In this letter we take existing constraints on the $\Lambda$CDM cosmological model from two early time probes, Planck and WMAP, and two late time probes, DES galaxy lensing and clustering and Baryon Acoustic Oscillations, and propagate these through to constraints on the magnitude of the dark ages 21-cm signal. We constrain the magnitude and central frequency of the signal while methodically accounting for uncertainties in the cosmological parameters. We find that within the context of our modelling assumptions and the $\Lambda$CDM paradigm, the depth of the dark ages 21-cm signal is known to better than 1 mK and the central frequency to within 0.05 MHz.

arXiv commentUpdated to be in line with the journal

References in corpus (53)

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• The Pantheon+ Analysis: Cosmological Constraints
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Hydrogen Epoch of Reionization Array (HERA)
• Measurements of the Hubble Constant: Tensions in Perspective
• Possible interaction between baryons and dark-matter particles revealed by the first stars
• Insights on Dark Matter from Hydrogen during Cosmic Dawn
• The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn
• Severely Constraining Dark Matter Interpretations of the 21-cm Anomaly
• Concerns about Modelling of the EDGES Data
• Signs of Dark Matter at 21-cm?
• Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude
• Early-Universe Constraints on Dark Matter-Baryon Scattering and their Implications for a Global 21cm Signal
• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
• What does the first highly-redshifted 21-cm detection tell us about early galaxies?
• Constraining Baryon--Dark Matter Scattering with the Cosmic Dawn 21-cm Signal
• Tighter Limits on Dark Matter Explanations of the Anomalous EDGES 21cm Signal
• Reviving Millicharged Dark Matter for 21-cm Cosmology
• Testing for calibration systematics in the EDGES low-band data using Bayesian model selection
• Towards a complete treatment of the cosmological recombination problem
• The redshifted 21-cm signal in the EDGES low-band spectrum
• The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology
• anesthetic: nested sampling visualisation
• Recombinations to the Rydberg States of Hydrogen and Their Effect During the Cosmological Recombination Epoch
• High-redshift radio galaxies: a potential new source of 21-cm fluctuations
• The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
• fgivenx: A Python package for functional posterior plotting
• maxsmooth: Rapid Maximally Smooth Function Fitting With Applications in Global 21-cm Cosmology
• Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
• HYREC-2: a highly accurate sub-millisecond recombination code
• Radio background and IGM heating due to Pop III supernovae explosions
• Mapper of the IGM spin temperature: instrument overview
• Prospects for precision cosmology with the 21 cm signal from the dark ages
• Bayesian noise wave calibration for 21-cm global experiments
• A Bayesian Calibration Framework for EDGES
• 21cmFirstCLASS I. Cosmological tool for $\Lambda$CDM and beyond
• Constraining exotic dark matter models with the dark ages 21-cm signal
• Receiver design for the REACH global 21-cm signal experiment
• First upper limits on the 21-cm signal power spectrum of neutral hydrogen at $z=9.16$ from the LOFAR 3C196 field
• RFSoC receiver calibration system for 21-cm global spectrum experiments from space: The CosmoCube case
• Accounting for Noise and Singularities in Bayesian Calibration Methods for Global 21-cm Cosmology Experiments
• Radiometer Calibration using Machine Learning