Titlebook: String Field Theory; A Modern Introductio Harold Erbin Textbook 2021 Springer Nature Switzerland AG 2021 String scattering amplitudes.Off-s

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Amplitude Factorization and Feynman DiagramsIn the previous chapter, we built the off-shell amplitudes by integrating forms on sections of .. Studying their factorizations leads to rewrite them in terms of Feynman diagrams, which allows to identify the fundamental interactions’ vertices. We will then be able to write the SFT action in the next chapter.

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Harold ErbinAn essential text to get acquainted with string field theory.Pedagogical primer suitable for a one-semester course.Contains many examples, exercises and computations

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Geometry of Moduli Spaces and Riemann Surfacesrevious chapter. Then, we can characterize the tangent space that we will need in the next chapter to write the .-forms on . necessary to write the amplitudes. Finally, we introduce the notion of plumbing fixture, an operation that glues together punctures located on the same or different surfaces.

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Off-Shell Amplitudesf . by constructing .-forms. The reason why we need to consider the CFT is that ghosts are necessary to build the .-forms: this can be understood from Chap. ., where we found that the ghosts must be interpreted as part of the measure on the moduli space. Then, we build the off-shell amplitudes and discuss some properties.