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Explore the cutting-edge insights and enduring mysteries of modern cosmology in this World Science Festival talk featuring leading cosmologist Matias Zaldarriaga in conversation with Brian Greene. Delve into Zaldarriaga's early inspirations and career journey before examining the revolutionary Cosmic Microwave Background (CMB) breakthroughs of the 1990s that fundamentally redefined our understanding of the universe. Learn about the development and open-source impact of CMBfast, a computational tool that transformed cosmological research, and discover how CMB observations shifted the field from theoretical speculation to precision science. Navigate the ongoing inflation debate and explore the scientific boundaries surrounding multiverse theories, while investigating how gravitational waves provide new cosmic clues about the universe's origins and evolution. Examine the lessons learned from the BICEP2 false alarm and understand the current Hubble tension crisis that challenges our cosmological models. Follow Zaldarriaga's transition from CMB research to gravitational wave physics, and explore the fascinating world of pulsar timing arrays that detect the cosmic gravitational wave background. Conclude by considering how artificial intelligence is revolutionizing cosmological research and shaping the future of our understanding of the universe. This comprehensive discussion balances theoretical frameworks with observational evidence, offering insights into both established cosmological principles and the field's most pressing unsolved problems.
