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SUMMARY:Wolfgang Lerche (CERN)
DTSTART:20210528T080000Z
DTEND:20210528T090000Z
DTSTAMP:20260423T024537Z
UID:CGP-MP/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CGP-MP/11/">
 Fluxes\, Holomorphic Anomalies and Elliptic Genera in d=4</a>\nby Wolfgang
  Lerche (CERN) as part of IBS-CGP Mathematical Physics Seminar\n\n\nAbstra
 ct\nMotivated by tests of Weak Gravity Conjectures\, we investigate proper
 ties of elliptic genera of string theories that arise in large distance li
 mits of the moduli space of F-theory compactifications. This allows for a 
 non-perturbative definition of elliptic genera that goes beyond the ordina
 ry world-sheet description. While this construction has been known for six
 -dimensional theories\, we find the four-dimensional variant to be surpris
 ingly complex. The essential new ingredient is background fluxes\, and the
 se lead to different sectors of the elliptic genus with different modular 
 properties. Crucial is the appearance of derivatives which leads to novel 
 modular (and hence\, holomorphic) anomalies that are much worse than expec
 ted. We also give a physical interpretation of these phenomena.\n
LOCATION:https://researchseminars.org/talk/CGP-MP/11/
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