The Rise and Fall of Acoustic Oscillations at Cosmic Dawn

arXiv:2607.09846 · astro-ph.CO, astro-ph.GA · Submitted 2026-07-10 · Read on arXiv

Hector Afonso G. Cruz, Gabriele Montefalcone, Julian B. Muñoz, Ely D. Kovetz, Alessandra Venditti

astro-ph.CO, astro-ph.GA

Submitted: 2026-07-10

Comments: 5+7 pages, 3+1 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• 21-cm Power Spectrum — 9× in this paper · explained in 1 episode
• 21-cm signal — 9× in this paper · explained in 1 episode
• Abundance — 4× in this paper · explained in 1 episode
• Anisotropy — 4× in this paper · explained in 3 episodes
• Trace — 4× in this paper · explained in 2 episodes
• Clustering — 3× in this paper · explained in 2 episodes
• Decoupling — 3× in this paper · explained in 2 episodes
• Square Kilometer Array — 3× in this paper
• Matter Power Spectrum — 2× in this paper · explained in 2 episodes
• 21-cm global signal — 1× in this paper · explained in 1 episode
• Calibration — 1× in this paper · explained in 7 episodes
• Consistency — 1× in this paper · explained in 3 episodes
• Core — 1× in this paper · explained in 2 episodes
• Metallicity — 1× in this paper · explained in 3 episodes
• Primordial Magnetic Fields — 1× in this paper · explained in 2 episodes
• Self-consistency — 1× in this paper · explained in 2 episodes
• alpha — 1× in this paper · explained in 1 episode

Sources

• Formation of the First Stars
• The first stars: formation, properties, and impact
• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations Through 21 cm Tomography Prior to the Epoch of Structure Formation
• Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• 21-cm cosmology
• Lyalpha versus X-ray heating in the high-z IGM
• Heating the IGM by X-rays from Population III Binaries in High Redshift Galaxies
• Constraining High Redshift X-ray Sources with Next Generation 21 cm Power Spectrum Measurements
• Preheating of the early Universe by radiation from high-mass X-ray binaries
• LOFAR: The LOw-Frequency ARray
• Reionization and the Cosmic Dawn with the Square Kilometre Array
• Probing the Dark Ages at Z~20: The SCI-HI 21 cm All-Sky Spectrum Experiment
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• First Season MWA EoR Power Spectrum Results at Redshift 7
• Exploring reionisation and high-z galaxy observables with recent multi-redshift MWA upper limits on the 21-cm signal
• Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\boldsymbol{z \approx 9.1}$ from LOFAR
• A new MWA limit on the 21 cm Power Spectrum at Redshifts $\sim$ 13 $-$ 17
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Probing the Dark Ages with the Square Kilometer Array

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