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From elliptic multiple zeta values to modular graph functions: open and closed strings at one loop

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Abstract

We relate one-loop scattering amplitudes of massless open-and closed-string states at the level of their low-energy expansion. The modular graph functions resulting from integration over closed-string punctures are observed to follow from symmetrized open-string integrals through a tentative generalization of the single-valued projection known from genus zero.
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cea-01729196 , version 1 (12-03-2018)

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Johannes Broedel, Oliver Schlotterer, Federico Zerbini. From elliptic multiple zeta values to modular graph functions: open and closed strings at one loop. 2018. ⟨cea-01729196⟩
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