BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Heterotic Dualities and Quantum Corrections in Four-Dimensional St
 ring Compactifications
DTSTART:20261020T120000Z
DTEND:20261020T130000Z
DTSTAMP:20261023T000600Z
UID:indico-event-1718643@indico.cern.ch
DESCRIPTION:Speakers: Max Wiesner (Hamburg U.)\n\nIn this talk\, I will di
 scuss recent progress in understanding four-dimensional theories of quantu
 m gravity arising from heterotic string theory and F-theory\, with a parti
 cular focus on the role of quantum corrections. In the first part\, I will
  show how the study of certain degenerations of Type IIB Calabi–Yau thre
 efold compactifications uncovers novel heterotic–Type II dualities\, whi
 ch in turn allow us to construct consistent non-geometric heterotic string
  backgrounds giving rise to four-dimensional N=2 theories of gravity.In th
 e second part\, I will turn to F-theory compactifications on Calabi–Yau 
 fourfolds\, which give rise to four-dimensional N=1 theories of gravity. B
 y analyzing extreme limits in the complex structure moduli space of these 
 fourfolds\, I will argue that\, contrary to classical expectations\, quant
 um corrections must become unsuppressed\, thereby invalidating the classic
 al four-dimensional N=1 supergravity effective action. This has important 
 implications for string model building\, highlighting the limitations of c
 lassical effective field theory descriptions in certain regions of the str
 ing landscape. This talk is based on joint work with Lukas Kaufmann\, Jero
 en Monnee\, and Timo Weigand\, as well as with Christian Aoufia and Giacom
 o Maggiorotti.\n\nhttps://indico.cern.ch/event/1718643/\n\nZoom: https://c
 ern.zoom.us/j/61053603623?pwd=THhlNnU4ZXljQjFxMjVwQlVxVHdQZz09
LOCATION:4/2-037 - TH meeting room (CERN)
URL:https://indico.cern.ch/event/1718643/
END:VEVENT
END:VCALENDAR