The redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-
dimensional surveys of our universe that reach unprecedentedly large volumes, previously …

We report the most sensitive upper limits to date on the 21 cm epoch of reionization power
spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization …

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 …

The recent tentative detection by the Experiment to Detect the Global EoR Signature
(EDGES) low band of the hydrogen 21-cm line from cosmic dawn, if confirmed, is the first …

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 …

Despite extensive search efforts, direct observations of the first [Population III (Pop III)] stars
have not yet succeeded. Theoretical studies have suggested that late Pop III star formation is …

The ARCADE2 and LWA1 experiments have claimed an excess over the cosmic microwave
background (CMB) at low radio frequencies. If the cosmological high-redshift contribution to …

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 …

Observations of the 21-cm line from primordial hydrogen promise to be one of the best tools
to study the early epochs of the Universe: the dark ages, the cosmic dawn and the …