Primordial black holes (PBHs) represent a natural candidate for one of the components of
the dark matter (DM) in the Universe. In this review, we shall discuss the basics of their …

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 …

The astrophysics of the cosmic dawn, when star formation commenced in the first collapsed
objects, is predicted to be revealed by spectral and spatial signatures in the cosmic radio …

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 …

We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9
and 10.4 with 18 nights of data (∼ 36 hr of integration) from Phase I of the Hydrogen Epoch …

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 existence of millicharged dark matter (mDM) can leave a measurable imprint on 21-cm
cosmology through mDM-baryon scattering. However, the minimal scenario is severely …

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), 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 …

The EDGES collaboration reported an unexpectedly deep absorption in the radio
background at 78 MHz and interpreted the dip as the first detection of a redshifted 21 cm …