N-loop superstring amplitude from Feynman-like rules; Spin structures including Ramond sector, handle operator and g-vacuum

U. Carow-Watamura, Z. F. Ezawa, Satoshi Watamura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Using the operator approach we construct the operator part of the N-loop amplitude of the superstring out of the three-string vertices and propagators. To include the Ramond sector straightforwardly into our formulation, the fermions are bosonized. As a result we obtain the g-vacuum expressed by the θ{symbol}-function for the corresponding Riemann surface of genus N with specified spin structure. This operator construction has the advantage of providing us with a handle operator connecting the two g-vacua for genus N and genus (N + 1) in a compact form.

Original languageEnglish
Pages (from-to)166-192
Number of pages27
JournalNuclear Physics, Section B
Volume315
Issue number1
DOIs
Publication statusPublished - 1989 Mar 13

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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