Perturbative diagrams in string field theory

Details Perturbative diagrams in string field theory Perturbative diagrams in string field theory

2002-07-13

arxiv.org/abs/hep-th/0207132v1

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, 9 eps figures, Latex

Scientific paper

A general algorithm is presented which gives a closed-form expression for an arbitrary perturbative diagram of cubic string field theory at any loop order. For any diagram, the resulting expression is given by an integral of a function of several infinite matrices, each built from a finite number of blocks containing the Neumann coefficients of Witten's 3-string vertex. The closed-form expression for any diagram can be approximated by level truncation on oscillator level, giving a computation involving finite size matrices. Some simple tree and loop diagrams are worked out as examples of this approach.

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