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Explore the theoretical foundations of cosmic microwave background radiation and linear perturbation theory in this comprehensive physics lecture delivered by Julien Lesgourgues at the Galileo Galilei Institute. Delve into advanced cosmological concepts as part of a structured lecture series, building upon fundamental principles to understand how small-scale fluctuations in the early universe evolved into the large-scale structure we observe today. Examine the mathematical framework underlying CMB analysis, including the linear theory approximations that govern perturbation growth in the expanding universe. Learn about the connection between primordial density fluctuations and the temperature anisotropies observed in the cosmic microwave background, gaining insights into how these observations provide crucial evidence for our understanding of cosmic evolution. Master the theoretical tools used by cosmologists to interpret CMB data and extract fundamental cosmological parameters, while developing a deeper appreciation for the elegant mathematical descriptions of our universe's early history.
