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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Superstringntly, the removal of the tachyon and the inclusion of fermions in the spectrum. The goal of this chapter is to introduce the most important concepts needed to generalize the bosonic string to the superstring, both for off-shell amplitudes and string field theory. We refer to the review [.] for more

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Worldsheet Path Integral: Vacuum Amplitudesnt (for any genus) and (3) we do not use complex coordinates but always a covariant parametrization..The derivation is technical and the reader is encouraged to not stop at this chapter in case of difficulties and to proceed forward: most concepts will be reintroduced from a different point of view later in other chapters of the book.

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Free BRST String Field Theoryl theory: equations of motion, action, gauge invariance and gauge fixing. Then, we perform the path integral quantization and compute the action in terms of spacetime fields for the first two levels (tachyon and gauge field).

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