Feynman rules for string field theories with discrete target space

Details Feynman rules for string field theories with discrete target space Feynman rules for string field theories with discrete target space

1995-06-03

arxiv.org/abs/hep-th/9506022v2

Phys.Lett. B357 (1995) 62-70

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, harvmac, 4 uuencoded figures included using epsf. A missing term added to the expression for the genus-one tadpole a

Scientific paper

10.1016/0370-2693(95)00878-O

We derive a minimal set of Feynman rules for the loop amplitudes in unitary models of closed strings, whose target space is a simply laced (extended) Dynkin diagram. The string field Feynman graphs are composed of propagators, vertices (including tadpoles) of all topologies, and leg factors for the macroscopic loops. A vertex of given topology factorizes into a fusion coefficient for the matter fields and an intersection number associated with the corresponding punctured surface. As illustration we obtain explicit expressions for the genus-one tadpole and the genus-zero four-loop amplitude.

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