Abstract
I demonstrate that open-string field theory with Chan-Paton factors has Yang-Mills theory as its off-shell zero-slope limit. I first add Chan-Paton group factors both to Witten's string field theory and to a non-oriented extension of it. The quadratic and cubic interactions between massless fields are calculated in the zero-slope limit by means of the Neumann functions computed for Witten's theory by Gross and Jevicki and by Cremmer, Schwimmer and Thorn. I show that the only other terms (up to renormalisation) appearing in the zero-slope limit are those from tree-level interactions between four massless fields. These are evaluated off-shell using the conformal mapping and Neumann function techniques developed by Giddings, by Sloan, and by Samuel. The resulting lagrangian is Yang-Mills theory in the Feynman-Lorentz-Baulieu- Thierry-Meig gauge.
Published Version
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