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Explore advanced concepts in quantum gravity and cosmology through this 48-minute conference talk examining the Hartle-Hawking state and its relationship to holographic theories. Delve into the fundamental problem that fixed holographic theories contain only one closed universe state, failing to produce semi-classical physics, and discover how incorporating a classical observer within the universe may resolve this issue. Investigate the specific case of the Hartle-Hawking state where the dominant Euclidean topology takes the form of a sphere, contrasting with earlier work on closed universes connected to asymptotic Euclidean boundaries. Learn about the distinct features that emerge in this spherical topology scenario and examine the potential implications for understanding de Sitter space. Gain insights into cutting-edge research on quantum aspects of black holes and spacetime, presented as part of a specialized workshop at the Institute for Advanced Study, based on collaborative work with Daniel Harlow from MIT.
