Neutral hydrogen (HI) has persisted for much of cosmic history, making it the best tracer to probe the Universe. Observation of the redshifted 21-cm signal due to the hyperfine transition of HI is a promising method to study its three-dimensional distribution in the Universe. The first billion years of cosmic history of the Universe mark the formation of the first stars and galaxies. After years of theoretical predictions, a considerable international effort is now producing the first tentative results, e.g. EDGES, SARAS, GMRT, LOFAR, MWA, HERA, etc. The coming theory and observations will reveal the mysterious era of cosmic dawn and reionization, including the properties of the first stars and galaxies, and possibly more exotic discoveries. There are also plans to probe the pre-stellar "dark ages" with telescopes on the moon. I will give a summary and update on current studies of 21-cm Cosmology and the Epoch of Reionization (EoR).
Zoom link: https://icts-res-in.zoom.us/j/87237942898?pwd=OGtIYlphNkR3WTNIYkQ3ZGIyQ3FKdz09
Meeting ID: 872 3794 2898
Passcode: 272723