The hydrogen 21-cm signal is predicted to be the richest probe of the young Universe,
including those eras known as the cosmic Dark Ages, the Cosmic Dawn (when the first star …

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 …

Modeling the 21-cm global signal from the Cosmic Dawn is challenging due to the many
poorly constrained physical processes that come into play. We address this problem using …

In this work we present 21cmfirstclass, a modified version of 21cmfast, the most popular
code in the literature for computing the inhomogeneities of the 21-cm signal. Our code uses …

Dark matter–baryon interactions can cool the baryonic fluid, which has been shown to
modify the cosmological 21-cm global signal. We show that in a two-component dark sector …

In the preceding article, we introduce 21cmfirstclass, a new code for computing the 21-cm
anisotropies, assembled from the merger of the two popular codes 21cmfast and class …

Predicting the 21-cm signal from the epoch of reionization and cosmic dawn is a complex
and challenging task. Various simplifying assumptions have been applied over the last …

The excess radio background detected by ARCADE 2 represents a puzzle within the
standard cosmological model. There is no clear viable astrophysical solution, and therefore …

While the Bbb Z 3 symmetric dark matter models have shown tremendous prospects in
addressing a number of (astro-) particle physics problems, they can leave interesting …

We propose a new observable for the 21 cm global signal during the dark ages,“the dark
age consistency ratio,” which could serve as a critical test of models beyond the standard Λ …