Poincaré series for modular graph forms at depth two. Part I. Seeds and Laplace systems

Journal of High Energy Physics

Daniele Dorigoni¹  Oliver Schlotterer²  Axel Kleinschmidt³ 

[1] Centre for Particle Theory & Department of Mathematical Sciences, Durham University, Lower Mountjoy;Department of Physics and Astronomy, Uppsala University;Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut);

关键词: Superstrings and Heterotic Strings;    Conformal Field Theory;    Differential and Algebraic Geometry;    String Duality;   

DOI  :  10.1007/JHEP01(2022)133

来源: DOAJ

【 摘 要 】

Abstract We derive new Poincaré-series representations for infinite families of non-holomorphic modular invariant functions that include modular graph forms as they appear in the low-energy expansion of closed-string scattering amplitudes at genus one. The Poincaré series are constructed from iterated integrals over single holomorphic Eisenstein series and their complex conjugates, decorated by suitable combinations of zeta values. We evaluate the Poincaré sums over these iterated Eisenstein integrals of depth one and deduce new representations for all modular graph forms built from iterated Eisenstein integrals at depth two. In a companion paper, some of the Poincaré sums over depth-one integrals going beyond modular graph forms will be described in terms of iterated integrals over holomorphic cusp forms and their L-values.

【 授权许可】

Unknown