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Explore a 49-minute lecture on string field theory (SFT) from a geometrical perspective, delivered by Harold Erbin from MIT at the Institut des Hautes Etudes Scientifiques (IHES). Delve into the second-quantized version of string theory, understanding how it provides explicit regularization of all amplitudes and allows the use of standard QFT techniques. Learn about the construction of SFT from 2D CFT data and moduli space decomposition of Riemann surfaces. Discover the background-independent nature of this decomposition and its role in determining a geometrical BV algebra, leading to the SFT action as a solution to the BV master equation. Examine the induced L-infinity algebra and its implications for action form and gauge symmetries. Conclude by exploring the application of neural networks in constructing moduli space data and computing the closed string tachyon potential, demonstrating the interplay between geometry and field theory.
