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Explore the fundamental question of why the cosmological constant exists in this comprehensive lecture by renowned physicist Raphael Bousso from the Galileo Galilei Institute. Delve into one of cosmology's most perplexing problems as Bousso examines the theoretical foundations and observational evidence surrounding the cosmological constant, which describes the energy density of empty space and drives the accelerating expansion of the universe. Investigate the profound implications of this constant for our understanding of dark energy, vacuum energy, and the ultimate fate of the cosmos. Analyze the fine-tuning problem associated with the cosmological constant's incredibly small yet non-zero value, and consider various theoretical approaches including anthropic reasoning, string theory landscapes, and multiverse scenarios that attempt to explain its existence. Examine how this fundamental parameter connects quantum field theory with general relativity and shapes our modern understanding of cosmological evolution from the early universe to its far future.
