Kaichuan Qi

Welcome. I am Kaichuan Qi (戚铠川), a PhD student in mathematics at Penn State University, advised by Ping Xu and Mathieu Stiénon. Before coming to Penn State, I completed my master’s degree at KU Leuven under the supervision of Marco Zambon, and my bachelor’s degree at CUHK-Shenzhen.

Research

I work in Poisson and symplectic geometry, especially from the perspective of Lie groupoids and Lie algebroids. My current research concerns symplectic groupoids, central extensions, and their connections to differentiable stacks, S¹-gerbes, reduction, and gauge-theoretic ideas. I also work on hyper-Lie Poisson geometry and graded-geometric methods in Poisson geometry.

Publications and Preprints

• (with Dadi Ni) Construction of S¹-gerbes over the stack [G/G] · arXiv
• (with Dadi Ni) Hyperkähler structures on leaves of hyper-Lie Poisson manifolds · journal | arXiv

Selected Presentations

• Hyperkähler structures from hyper-Lie Poisson manifolds
  Ritsumeikan University, July 2025
  CUHK-Shenzhen, May 2025
  KU Leuven, May 2025 
• Poster: Hyperkähler structures from hyper-Lie Poisson manifolds
  GAP Conference, September 2024, Sapienza Università di Roma 

Expository and Local Talks

• From principal bundles to gauge theory over a cylinder, Gauge Theory Reading Group, Penn State University, February 2026
• S¹-central extensions of Lie groupoids from group extensions, Student Geometry Seminar, Penn State University, November 2025

Research Visits

• Henan University, June 2025 (host: Dadi Ni)
• KU Leuven, May 2025 (host: Marco Zambon)

Contact

Email: kaichuan@psu.edu

Last updated: 2026-03-29