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On the modular structure of the genus-one Type II superstring low energy expansion

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arxiv 1502.06698 v2 pith:EDV6FQYU submitted 2015-02-24 hep-th math-phmath.MP

classification hep-thmath-phmath.MP
keywords functionsmodularcoefficientsenergyexpansionseriesstructureclass
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The analytic contribution to the low energy expansion of Type II string amplitudes at genus-one is a power series in space-time derivatives with coefficients that are determined by integrals of modular functions over the complex structure modulus of the world-sheet torus. These modular functions are associated with world-sheet vacuum Feynman diagrams and given by multiple sums over the discrete momenta on the torus. In this paper we exhibit exact differential and algebraic relations for a certain infinite class of such modular functions by showing that they satisfy Laplace eigenvalue equations with inhomogeneous terms that are polynomial in non-holomorphic Eisenstein series. Furthermore, we argue that the set of modular functions that contribute to the coefficients of interactions up to order D**10 R*4 are linear sums of functions in this class and quadratic polynomials in Eisenstein series and odd Riemann zeta values. Integration over the complex structure results in coefficients of the low energy expansion that are rational numbers multiplying monomials in odd Riemann zeta values.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  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...

  2. Towards Motivic Coactions at Genus One from Zeta Generators

    hep-th 2025-08 unverdicted novelty 6.0 of 10

    Proposes motivic coaction formulae for genus-one iterated integrals over holomorphic Eisenstein series using zeta generators, verifies expected coaction properties, and deduces f-alphabet decompositions of multiple mo...

  3. Equivariant primitives of Eisenstein series for congruence subgroups

    math.NT 2025-02 accept novelty 6.0 of 10

    Equivariant primitives of Eisenstein series for principal congruence subgroups are shown to equal the corresponding non-holomorphic Eisenstein series, including new weight-two cases expressed via single-valued logarithms.

  4. Lorentzian Regularization of the Type IIB Superstring Torus Vacuum

    hep-th 2026-06 unverdicted novelty 4.0 of 10

    A first direct regularized construction of the unprojected spin sectors of the Type IIB superstring torus vacuum is given via sector-resolved modular integrals.

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