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Deriving on-shell open string field amplitudes without using Feynman rules
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DOI：10.1093/ptep/ptab159.png)
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Abstract
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We present a series of new gauge-invariant quantities in Witten's open string field theory. They are defined for a given set of open string states which satisfy the physical state condition around a classical solution. For known classical solutions, we demonstrate that these gauge-invariant quantities compute on-shell tree-level scattering amplitudes around the corresponding D-brane configuration.
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