Titlebook: Introduction to String Theory; Sergio Cecotti Textbook 2023 The Editor(s) (if applicable) and The Author(s), under exclusive license to Sp

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Spectrum, Vertices, and BRST Quantizationwrite down the vertices of physical states, and prove unitarity. We discuss the role of the picture charge in the superstring, and deduce several general properties of perturbative (super)string theory. In the three preliminary sections we discuss subtle points of bosonization, light-cone quantizati

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Bosonic String Amplitudests . with . which yield the leading perturbative contributions. We construct and study the physical properties of the Veneziano and Shapiro–Virasoro amplitudes. We start by reviewing the techniques to compute path integrals for 2d non-compact free scalars and Fermi ., . systems living on general 2-m

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10d Superstring Theoriests. We discuss in detail the consistency conditions of the perturbative superstring theory, namely invariance under the mapping class group of the world-sheet and absence of dangerous tadpoles/divergences. To put things in a broader perspective, we start with a review of the mapping class group. The

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