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 …

Cosmic Dawn (CD), when the first stars and proto-galaxies began to form, is commonly
expected to be accompanied by an absorption signature at radio frequencies. This feature …

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 …

The H i 21 cm absorption line is masked by bright foregrounds and systematic distortions
that arise due to the chromaticity of the antenna used to make the observation coupling to …

Cosmic dawn, the onset of star formation in the early universe, can in principle be studied
via the 21-cm transition of neutral hydrogen, for which a sky-averaged absorption signal …

We summarize the second radio synchrotron background workshop, which took place on
2022 June 15–17 in Barolo, Italy. This meeting was convened because available …

The observation of the global 21 cm signal produced by neutral hydrogen gas in the
intergalactic medium (IGM) during the Dark Ages, Cosmic Dawn, and Epoch of Reionization …

The assumptions inherent to global 21 cm signal analyses are rarely delineated. In this
paper, we formulate a general list of suppositions underlying a given claimed detection of …

The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying
the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, the …

Global 21-cm experiments aim to measure the sky-averaged H i absorption signal from
cosmic dawn and the epoch of reionization. However, antenna chromaticity coupling to …