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Special Kähler geometry and collapsing

CMSA EVENTS: Differential Geometry and Physics Seminar

When: October 9, 2025
4:00 pm - 5:00 pm
Where: CMSA, 20 Garden St, G10
Address: 20 Garden Street, Cambridge, MA 02138, United States
Speaker: Xingyang Yu (Virginia Tech)

I will explore the interplay between symmetries and moduli spaces in string compactifications, starting from the familiar Calabi–Yau case and then taking some baby steps toward more general settings. A classical benchmark is the line bundle over Calabi–Yau complex structure moduli space, whose physical counterpart corresponds to the Berry phase of the spectral flow operator in worldsheet SCFT. I will review this story and then discuss how it begins to change in c=1 theories with worldsheet anomalies, and in G_2 and Spin(7) compactifications where U(1)_R symmetry is absent. The goal is not a finished framework, but to highlight how anomalies and non-invertible symmetries may enter the picture and to raise open questions about what kinds of structures might live over moduli spaces beyond Calabi–Yau.

Zoom link: https://harvard.zoom.us/j/97698322233?pwd=m1RqxppdkHLwO4UvJmG4MmO4Bm0uzY.1
Password / Meeting ID: 828156 / 976 9832 2233