YOUNGST@RS - Single-Valued Periods in Scattering Amplitudes

14 Jan 2026, 09:00 → 16 Jan 2026, 17:30 Europe/Berlin

Mainz Institute for Theoretical Physics, Johannes Gutenberg University

In recent years, the study of single-valued periods has proven interesting to both physicists and mathematicians, in particular in the field of scattering amplitudes where some physical quantities are naturally expressed in terms of these functions.  

Scientific exchange between mathematicians and physicists is therefore paramount, as the physics might indicate interesting structures overlooked by mathematicians and mathematicians offer the needed rigor to study these functions properly.

 In this three-day workshop we aim to bring together young researchers working on single-valued periods and related functions which appear in scattering amplitudes. 

The goal is to give young researchers an opportunity to present their recent work, share techniques and establish new connections which can lead to collaborations.

The workshop will have three main topics: 

- The formal mathematical side of single-valued periods.

- (Single-valued) functions in Feynman integrals.

- Single-valued functions in string theory scattering amplitudes both at tree- and loop-level.

Single Valued Periods_picture.pdf

Wednesday 14 January

09:00 → 09:15 Welcome

09:15 → 10:15 Axel Kleinschmidt: Single-valued periods in string theory

10:15 → 11:00 Aurélie Sangaré: Single-Valued Periods in String Theory: From Flat Space to AdS

11:00 → 11:45 Yi-Xiao Tao

12:00 → 14:00 Break

14:00 → 14:45 Marco Baccianti: Rademacher evaluations of modular integrals

14:45 → 15:30 Emiel Claassen: Single-valued periods in one-loop superstring amplitudes

Thursday 15 January

09:30 → 10:15 Carlos Rodriguez: Hypergeometric Integrals on a Punctured Riemann Surface

10:15 → 11:15 Stephan Stieberger

11:15 → 12:00 Simone Hu

12:00 → 14:00 Break

14:00 → 15:00 Clement Dupont: Single-valued integration, a cohomological viewpoint

15:30 → 16:15 Franca Lippert

16:15 → 17:00 Ulysee Mounoud: The Motivic Coaction of One-loop Feynman Integrals

Friday 16 January

09:30 → 10:45 Claude Duhr

11:00 → 11:45 Gaia Fontana: Parametric annihilators and differential equations for twisted integrals

12:00 → 14:00 Break

14:00 → 14:45 Cathrin Semper: Symmetry Invariant Twisted Cohomology

14:45 → 15:30 Felix Forner: Calabi-Yau Periods in QED

15:30 → 16:15 Pouria Mazloumi: Geometry of Feynman Integrals: A (slightly) New perspective

16:15 → 17:15 Andrzej Pokraka