|
Résumé |
Perturbative calculations of string amplitudes are twofold: an expansion in the
string coupling (the genus expansion of the worldsheet) and a low-energy
expansion in the momenta. In this talk, I will focus on the low-energy expansion
of closed string amplitudes at genus one, specifically for four- and five-point
massless states of type IIB superstrings in flat spacetime. Evaluating these
amplitudes involves integrating over the moduli space of punctured tori. I will
demonstrate how the formalism of equivariant iterated Eisenstein integrals can
be used to systematically calculate these integrals. Additionally, I will
discuss the implications of these results for the S-duality of type IIB. |
