String Theory 2: Fermionic Strings - Lecture 4 (2025-02-04)

Explore the fundamentals of fermionic strings in this 1 hour 44 minute lecture from the String Theory 2 course (PHY453.5) delivered by Ashoke Sen at the International Centre for Theoretical Sciences. The fourth lecture in the series covers essential concepts of supersymmetric string theories, focusing on Free Heterotic String, Free Type II and Type I Superstring theories, interactions, picture changing operators, and amplitude computations. Designed for advanced physics students with prior knowledge in Quantum Field Theory, General Relativity, and String Theory 1, this lecture helps develop skills in computing the spectrum and interactions in supersymmetric string theories. Part of a semester-long course scheduled on Tuesdays and Thursdays starting January 21, 2025.