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Explore the fundamental principles of Cosmic Microwave Background (CMB) radiation and linear perturbation theory in this comprehensive lecture delivered by Julien Lesgourgues at the Galileo Galilei Institute. Delve into the theoretical foundations that underpin our understanding of the early universe, examining how small density fluctuations in the primordial cosmos evolved to create the temperature anisotropies we observe in the CMB today. Learn about the mathematical framework of linear theory and its applications in cosmology, including how perturbations in matter and radiation interact during the universe's early epochs. Gain insights into the physical processes that shaped the CMB spectrum and understand the connection between theoretical predictions and observational data. Master the essential concepts needed to analyze CMB measurements and their implications for cosmological parameters, providing a solid foundation for advanced studies in theoretical cosmology and observational astronomy.
