ABSTRACT The patchy kinetic Sunyaev–Zel'dovich (kSZ) signal is an integral probe of the
timing and morphology of the epoch of reionization (EoR). Recent observations have …

ABSTRACT During the Epoch of Reionization (EoR), the ultraviolet radiation from the first
stars and galaxies ionized the neutral hydrogen of the intergalactic medium, which can emit …

The 21cm line refers to a forbidden transition in neutral hydrogen associated with alignment
of spins of the proton and electron. It is a very low energy transition that is emitted whenever …

Foreground removal presents a significant obstacle in both current and forthcoming intensity-
mapping surveys. While numerous techniques have been developed that show promise in …

Measurement of the global 21-cm signal during Cosmic Dawn and the Epoch of
Reionization is made difficult by bright foreground emission which is 2–5 orders of …

The patchiness in the reionization process alters the statistics of cosmic microwave
background (CMB), with the kinematic Sunyaev–Zeldovich (kSZ) effect in the CMB …

Intensity mapping—the large-scale mapping of selected spectral lines without resolving
individual sources—is quickly emerging as an efficient way to conduct large cosmological …

The H i 21 cm global signal from the Cosmic Dawn and the Epoch of Reionization (EoR)
offers critical insights into the evolution of our Universe. Yet, its detection presents significant …

Recent results of ground-based telescopes, giving high-quality measurements of the cosmic
microwave background (CMB) temperature power spectrum on small scales (below 1 deg) …

In this thesis, I describe several advances in modelling sources of systematic error
associated with microwave telescope optics. Microwave telescopes observing the Cosmic …