BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Axel Kleinschmidt (Professor and Senior Scientist\, Quantum Gravit y and Unified Theories Group\, Max Planck Institute for Gravitational Phys ics\, Potsdam\, Germany) DTSTART:20200608T130000Z DTEND:20200608T143000Z DTSTAMP:20260423T010927Z UID:QASTM/9 DESCRIPTION:Title: Ge nerating series for closed string scattering at genus one\nby Axel Kle inschmidt (Professor and Senior Scientist\, Quantum Gravity and Unified Th eories Group\, Max Planck Institute for Gravitational Physics\, Potsdam\, Germany) as part of Quantum Aspects of Space-Time and Matter\n\n\nAbstract \nThe low-energy limit of closed string scattering amplitudes has recently received an increased amount of attention due to new connections to numbe r theory and automorphic forms that I will explain in this talk. The low-e nergy expansion for n-point scattering can be formulated in terms of objec ts called modular graph forms. Writing down these forms is easy but analys ing them less so since they satisfy an intricate web of surprising relatio ns. I will discuss recent progress on systematising their properties based on generating function techniques and comment on a relation between open and closed string scattering. The talk is mainly based on 1911.03476 and 2 004.05156.\n LOCATION:https://researchseminars.org/talk/QASTM/9/ END:VEVENT END:VCALENDAR