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On-shell recursion in string theory

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Abstract

We prove that all open string theory disc amplitudes in a flat background obey Britto-Cachazo-Feng-Witten (BCFW) on-shell recursion relations, up to a possible reality condition on a kinematic invariant. Arguments that the same holds for tree level closed string amplitudes are given as well. Non-adjacent BCFW-shifts are related to adjacent shifts through monodromy relations for which we provide a novel CFT based derivation. All possible recursion relations are related by old-fashioned string duality. The field theory limit of the analysis for amplitudes involving gluons is explicitly shown to be smooth for both the bosonic string as well as the superstring. In addition to a proof a less rigorous but more powerful argument based on the underlying CFT is presented which suggests that the technique may extend to a much more general setting in string theory. This is illustrated by a discussion of the open string in a constant B-field background and the closed string on the level of the sphere.

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Authors and Affiliations

  1. Niels Bohr International Academy and DISCOVERY center, Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen, Denmark

    Rutger H. Boels

  2. Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen, Denmark

    Daniele Marmiroli & Niels A. Obers

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  1. Rutger H. Boels
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  2. Daniele Marmiroli
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  3. Niels A. Obers
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Correspondence to Rutger H. Boels.

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ArXiv ePrint: 1002.5029

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Boels, R.H., Marmiroli, D. & Obers, N.A. On-shell recursion in string theory. J. High Energ. Phys. 2010, 34 (2010). https://doi.org/10.1007/JHEP10(2010)034

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