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Explore quantum field theory in de Sitter spacetime through this advanced physics lecture from the VI Siembra-HoLAGrav Young Frontiers Meeting at ICTP-SAIFR. Delve into the quantum aspects of a universe with positive cosmological constant (Λ+0) as presented by Dionysios Anninos from King's College London. Examine the theoretical foundations and mathematical frameworks needed to understand quantum phenomena in expanding spacetime geometries. Investigate the challenges and insights that arise when applying quantum mechanics to cosmological settings with positive curvature. Analyze the implications for our understanding of the early universe, inflation, and the fundamental nature of spacetime at quantum scales. This fifth class in the series builds upon previous concepts to provide a comprehensive treatment of quantum field theory in de Sitter space, making it essential viewing for graduate students and researchers working in theoretical physics, cosmology, and quantum gravity.
