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Explore quantum field theory in de Sitter spacetime through this advanced physics lecture delivered at the VI Siembra-HoLAGrav Young Frontiers Meeting. 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 fundamental challenges and theoretical frameworks for understanding quantum mechanics in expanding spacetimes, including discussions of vacuum states, particle creation, and the complexities of defining observables in de Sitter space. Investigate the interplay between gravity and quantum field theory in cosmological contexts, with particular attention to the unique features that distinguish de Sitter quantum field theory from its flat spacetime counterpart. This second class in the series builds upon foundational concepts to address more sophisticated aspects of quantum gravity and cosmology, providing insights into current research frontiers in theoretical physics and the mathematical tools needed to tackle problems in quantum cosmology.
