Abstract Recently, the Hydrogen Epoch of Reionization Array (HERA) has produced the
experiment's first upper limits on the power spectrum of 21 cm fluctuations at z∼ 8 and 10 …

In this review article, we briefly outline our current understanding of the physics associated
with the HI 21-cm signal from cosmic dawn. We discuss different phases of cosmic dawn as …

Observations of the redshifted 21-cm line of atomic hydrogen have provided several upper
limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal at …

Cosmic dawn (CD) and the epoch of reionization (EoR) are the most important parts of
cosmic history during which the first luminous structures emerged. These first objects heated …

ABSTRACT The Murchison Widefield Array (MWA) team has derived new upper limits on the
spherically averaged power spectrum of the 21-cm signal at six redshifts in the range z≈ 6.5 …

Radio sources are expected to have formed at high redshifts, producing an excess radiation
background above the cosmic microwave background (CMB) at low frequencies. Their effect …

ABSTRACT Cosmic Dawn (CD) and Epoch of Reionization (EoR) are epochs of the
Universe which host invaluable information about the cosmology and astrophysics of X-ray …

We use the latest multiredshift (z= 6.5− 8.7) upper limits on the 21-cm signal from the
Murchison Widefield Array (MWA) to explore astrophysical models which are inconsistent …

The attenuation of Lyα photons by neutral hydrogen in the intergalactic medium (IGM) at z≳
5 continues to be a powerful probe for studying the epoch of reionization. Given a framework …

Using the latest upper limits on the 21-cm power spectrum at z≈ 9.1 from the Low
Frequency Array (LOFAR), we explore the regions of parameter space which are …