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Closed String Amplitudes in Open String Field Theory

Takahashi, T, Zeze, S

Abstract

We investigate gauge invariant operators corresponding to on-shell closed string states in open string field theory. Using both oscillator representation and conformal mapping techniques, we calculate a two closed string tachyon amplitude that connects two gauge invariant operators by an open string propagator.We find that this amplitude is in a complete agreement with the usual disc amplitude.

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Key concepts: String field theory, Non-critical string theory, Tachyon, Physics, String cosmology, Open string, Bosonic string theory, Type I string theory