Seung-Yeon Ryoo The Division of Physics, Mathematics and Astronomy California Institute of Technology

I am a postdoctoral teaching fellow at the Mathematics Department of the California Institute of Technology. Previously, I received my Ph.D. in 2023 at Princeton University under the supervision of Professor Assaf Naor. Starting in August 2026, I will be a postdoctoral researcher at the Hausdorff Center for Mathematics at the University of Bonn.

CV

Research Interests.

• Metric geometry of nilpotent Lie groups, especially Carnot groups.
• Bilipschitz and snowflake embeddings of metric spaces into Euclidean and L^p spaces.
• Rigorous approaches to mathematical models of synchronization, with an emphasis on the Winfree and Kuramoto models.

Teaching.

• Spring 2025-26: Ma 109c (Introduction to Geometry and Topology)
• Winter 2025-26: None
• Fall 2025-26: Ma 109a (Introduction to Geometry and Topology)

Publications and Preprints.

1. On oscillator death in the Winfree model arXiv Preprint
2. Inertia perturbation theory for the inertial Kuramoto model (with Hangjun Cho, Jiu-Gang Dong, and Seung-Yeal Ha). arXiv Preprint
3. Quantitative relaxation dynamics from generic initial configurations in the Kuramoto model (with Hangjun Cho, Jiu-Gang Dong, and Seung-Yeal Ha). arXiv Preprint
4. Asymptotics of Riemannian Lie groups with nilpotency step 2 (with Enrico Le Donne, Luca Nalon, Sebastiano Nicolussi Golo). arXiv Preprint
5. Quantitative nonembeddability of groups of polynomial growth into uniformly convex spaces. arXiv Preprint
6. Asymptotic formation and orbital stability of phase-locked states in Kuramoto–Lohe type synchronization models on Lie groups. Commun. Math. Sci. 23 1221–1239 (2025) arXiv
7. On the sharpness of the Assouad embedding theorem for finitely generated groups of polynomial growth and nilpotent Lie groups. Doctoral disseration at Princeton University. (2023) Proquest link
8. Embedding snowflakes of Carnot groups into bounded dimensional Euclidean spaces with optimal distortion. Analysis & PDE. 15, 1933-1990 (2022) arXiv
9. Constants of motion for the Lohe model with frustration and its applications to emergent dynamics (with Seung-Yeal Ha, Dohyun Kim, Hansol Park). Physica D: Nonlinear Phenomena. 416, 132781 (2021) arXiv
10. Asymptotic phase-locking dynamics and critical coupling strength for the Kuramoto model (with Seung-Yeal Ha). Commun. Math. Phys. 377, 811-857 (2020) arXiv
11. On the relaxation dynamics of Lohe oscillators on some Riemannian manifolds (with Seung-Yeal Ha, Dongnam Ko). J. Stat. Phys. 172, 1427-1478 (2018)
12. Emergence of partial locking states from the ensemble of Winfree oscillators (with Seung-Yeal Ha, Dongnam Ko, Jinyeong Park). Quart. Appl. Math. 75, 39-68 (2017)
13. Emergent dynamics of a generalized Lohe model on some class of Lie groups (with Seung-Yeal Ha, Dongnam Ko). J. Stat. Phys. 168, 171-207 (2017)
14. On the finiteness of collisions and phase-locked states for the Kuramoto model (with Seung-Yeal Ha, Hwa Kil Kim). J. Stat. Phys. 163, 1394-1424 (2016)
15. Emergence of phase-locked states for the Kuramoto model in a large coupling regime (with Seung-Yeal Ha, Hwa Kil Kim). Commun. Math. Sci. 14, 1073-1091 (2016)
16. On the emergence and orbital stability of phase-locked states for the Lohe model (with Seung-Yeal Ha). J. Stat. Phys. 163, 411-439 (2016)
17. Emergent dynamics of Winfree oscillators on locally coupled networks (with Seung-Yeal Ha, Dongnam Ko, Jinyeong Park). J. Differential Equations 260, 4203-4236 (2016)
18. Emergence of phase-locked states for the Winfree model in a large coupling regime (with Seung-Yeal Ha, Jinyeong Park), Discrete and Continuous Dynamical Systems 35, 3417-3436 (2015)