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This lecture explores the physics and cosmology of the 21-cm signal, delivered by Kanan Kumar Datta as part of the "Radio Cosmology and Continuum Observations in the SKA Era: A Synergic View" program at the International Centre for Theoretical Sciences. Delve into the scientific foundations of radio astronomy with a focus on the 21-cm hydrogen line and its cosmological implications. The presentation is part of a comprehensive two-week program bringing together experts in radio cosmology and continuum science in preparation for the Square Kilometre Array (SKA) telescope operations beginning in 2027. Learn about cutting-edge research that will contribute to one of the greatest scientific and engineering achievements of the 21st century, covering advanced modeling, observations, and analysis techniques relevant to SKA key science projects.
