3 papers
hep-th2026
Five-point Type IIB String Amplitudes at One Loop
Emiel Claasen, Mehregan Doroudiani
Massless type IIB superstring amplitudes are organized according to the number of external states and their charge under the R-symmetry of type IIB supergravity. I…
hep-th2025
Type II superstring amplitude at one-loop and transcendentality
Emiel Claasen, Mehregan Doroudiani
We calculate the four-graviton scattering amplitude in Type II superstring theory at one loop up to seventh order in the low-energy expansion through the recently developed iterate…
hep-th2025
From Modular Graph Forms to Iterated Integrals
Emiel Claasen, Mehregan Doroudiani
Modular graph forms are a class of non-holomorphic modular forms that arise in the low-energy expansion of genus-one closed string amplitudes. In this work, we introduce a systemat…