Abstract
In this chapter, we introduce a framework to describe off-shell amplitudes in string theory. We first start by motivating various concepts—in particular, local coordinates and factorization—by focusing on the 3- and 4-point amplitudes. We then prepare the stage for a general description of off-shell amplitudes. We focus again on the closed bosonic string only.
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Notes
- 1.
The quantum number (k, j) of the vertex operator is mostly irrelevant for the discussion of the current and next chapters, and they are omitted. We will distinguish them by a number and reintroduce the momentum k when necessary. We also omit the overall normalization of the amplitudes.
- 2.
The notation will become clear later and should not be confused with the vertex operators.
References
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Erbin, H. (2021). Introduction to Off-Shell String Theory. In: String Field Theory. Lecture Notes in Physics, vol 980. Springer, Cham. https://doi.org/10.1007/978-3-030-65321-7_11
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DOI: https://doi.org/10.1007/978-3-030-65321-7_11
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