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A seminar presentation explores how radio telescopes using 21 cm emission lines from neutral hydrogen can map vast regions of the universe to understand crucial periods in cosmic history. Dive into the limitations of current cosmological models based on Cosmic Microwave Background and distant galaxy observations, and discover how interferometric radio telescopes are filling observational gaps. Learn about the Cosmic Dawn period when the first stars and galaxies formed, and the Epoch of Reionization when early celestial bodies ionized the intergalactic medium. Examine recent advances in constraining early galaxy formation models through 21 cm intensity mapping and explore the potential of next-generation experiments like the DSA-2000 in advancing our understanding of the universe's origins and evolution.
