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Double-Copy Structure of One-Loop Open-String Amplitudes.

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In this Letter, we provide evidence for a new double-copy structure in one-loop amplitudes of the open superstring. Their integrands with respect to the moduli space of genus-one surfaces are… Click to show full abstract

In this Letter, we provide evidence for a new double-copy structure in one-loop amplitudes of the open superstring. Their integrands with respect to the moduli space of genus-one surfaces are cast into a form where gauge-invariant kinematic factors and certain functions of the punctures-so-called generalized elliptic integrands-enter on completely symmetric footing. In particular, replacing the generalized elliptic integrands by a second copy of kinematic factors maps one-loop open-string correlators to gravitational matrix elements of the higher-curvature operator R^{4}.

Keywords: double copy; one loop; copy structure; structure one; loop; loop open

Journal Title: Physical review letters
Year Published: 2018

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