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Feynman Diagrams In String Theory - Institute for Advanced ...
www.sns.ias.eduFeynman Diagrams In String Theory Edward Witten PiTP, July 25, 2013. I will aim to explain the minimum about string perturbation theory that every quantum physicist should know. When we look at a Feynman diagram we assign a propagator 1=(p2 + m2) to each line. We can write 1 p2 + m2 = Z 1 0