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Schlagwörter:
High Energy Physics - Theory, hep-th,Mathematics, Number Theory, math.NT
Zusammenfassung:
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.
