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Laplace-eigenvalue equations for length three modular iterated integrals

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arxiv 2104.09916 v2 pith:XYCEQZSW submitted 2021-04-20 math.NT

classification math.NT
keywords modularintegralsiteratedlengthanalyticlaplace-eigenvaluerealspace
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A space of modular iterated integrals sits inside the space of real analytic modular forms. We present a theorem for producing length three modular iterated integrals which are not simply combinations of real analytic Eisenstein series; each function has an associated Laplace-eigenvalue equation. This can be viewed as an extension of the length two case recently given by F. Brown, a review of which is included in this paper. We discuss how modular iterated integrals could help understand the modular graph functions which arise in string perturbation theory.

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  1. From Modular Graph Forms to Iterated Integrals

    hep-th 2025-02 conditional novelty 7.0 of 10

    A tree-based algorithm converts modular graph forms into equivariant iterated Eisenstein integrals, is implemented for topologies up to four vertices, and is used to extract the alpha'^8 zeta3 zeta5 term of the four-g...

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