OCAMI Colloquium (2026)
List of OCAMI Colloquium by Year
| Date | November 11(Wed.), 2026, 16:30-17:30 |
|---|---|
| Speaker | Akiyama Shigeki(Professor Emeritus, Tsukuba University) |
| Title | TBA |
| Place | Room F415, Science Building E, Sugimoto Campus & Zoom |
| Abstract | TBA |
| Registration | Please register by 9:00 on November 11 Registration Form |
| Note |
| Date | October 7(Wed.), 2026, 17:00-18:00 |
|---|---|
| Speaker | Kamada Seiichi(Osaka University) |
| Title | TBA |
| Place | Room E408, Science Building E, Sugimoto Campus |
| Abstract | TBA |
| Registration | Please register by 9:00 on October 7 Registration Form |
| Note | No online streaming (Zoom) will be provided. |
| Date | July 16(Thu.), 2026, 16:00-17:00 |
|---|---|
| Speaker | Rei Murakami( Osaka Metropolitan University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on July 16 Registration Form |
| Note |
| Date | July 7(Tue.), 2026, 14:45-15:45 |
|---|---|
| Speaker | Yusuke Nishinaka (Osaka Metropolitan University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on July 7 Speakers: Prof. Nishinaka and Prof. Sun Registration Form |
| Note | |
| Date | July 7(Tue.), 2026, 16:00-17:00 |
| Speaker | Lijie Sun(Osaka Metropolitan University) |
| Title | On geometric aspects of complex hyperbolic triangle groups |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | A complex hyperbolic triangle group of type $(p, q, r)$ $(p, q, r \in {\bf N})$ is a subgroup of ${\bf{PU}}(2, 1)$ generated by three complex reflections $I_1, I_2, I_3$. Each complex reflection fixes a complex geodesic and the angles between these complex geodesics are $\pi/p, \pi/q,$ and $\pi/r,$ respectively. Unlike (real) hyperbolic triangle groups, which are rigid and always give rise to Fuchsian groups, the deformation space of the complex hyperbolic triangle of type $(p, q, r)$ is one-parameter and are not necessarily discrete. Nevertheless, they still exhibit strong connections with Fuchsian groups and hyperbolic manifolds. In this talk, we study such relations for several special types of complex hyperbolic triangle groups. We also discuss the limit sets of spherical CR uniformization associated with complex hyperbolic triangle groups. |
| Note |
| Date | July 2(Thu.), 2026, 17:00-18:00 |
|---|---|
| Speaker | Tsuyoshi Yoneda(Hitotsubashi University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on July 2 Registration Form |
| Note |
| Date | Jun 19(Fri.), 2026, 13:15-14:15 |
|---|---|
| Speaker | Travis Scrimshaw(Hokkaido University) |
| Title | The combinatorics of lattice models |
| Place | Room E211, Science Building E, Sugimoto Campus & Zoom |
| Abstract | The six vertex lattice model originates from mathematical physics as a toy model for ice with local configurations given certain weights. By taking appropriate weights and boundary conditions, we can obtain a number of special functions as the weighted sum over all states, which is known as the partition function of the model. In this talk, we will discuss a number of different such six vertex models with an additional special condition, which is the existence of special “tilted” local configurations that satisfies a local relation called the Yang-Baxter equation. We will also show how to connect the states of these models with combinatorial data. By slightly shifting our perspective to realize the local configurations as the movements of particles, we can obtain additional recursion relations on the partition functions. |
| Registration | Please register by 9:00 on Jun 19 Registration Form |
| Note |