Gravity and String Theory in General Spacetime Signature

Explore a 94-minute lecture by Dr. Thomas Mohaupt from the University of Liverpool, delivered at the Isaac Newton Institute as part of the "Black holes: bridges between number theory and holographic quantum information" event series. Delve into the complex relationship between gravity and string theory across various spacetime signatures, examining how analytic continuation from Lorentzian to Euclidean signature serves as a fundamental tool in quantum field theory. Learn about the emergence of complexified spacetimes following Witten's work, and understand multiple-time signatures in the context of F-theory, S-theory, and four-dimensional applications. Discover how non-Lorentzian signatures and dynamical signature changes manifest in string theory, including Hawking's no-boundary proposal and type-II superstring theories. Examine recent research findings from collaborative work with Louis Gall, Giacomo Pope, and Maxime Medevielle, while exploring open problems that may be addressed through integrability and deep learning methodologies.