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Explore the fundamental physics underlying the cosmic microwave background (CMB) in this advanced lecture from the V Joint ICTP-Trieste/ICTP-SAIFR School on Cosmology. Delve into the theoretical foundations and observational aspects of the CMB, examining how this relic radiation from the early universe provides crucial insights into cosmological parameters and the structure formation of the cosmos. Learn about the physical processes that shaped the CMB, including recombination, Thomson scattering, and the acoustic oscillations that created the characteristic temperature fluctuations we observe today. Investigate the mathematical framework used to analyze CMB data, including power spectrum analysis and the extraction of cosmological information from temperature and polarization measurements. Discover how CMB observations have revolutionized our understanding of dark matter, dark energy, and the overall geometry of the universe. Examine current and future CMB missions and their technological capabilities for precision measurements. This lecture builds upon previous classes in the series, providing deeper insights into advanced topics in CMB physics and their implications for modern cosmology.
