PROGRAM
11:00 (GMT+3)
| Stefan Nemirovski | MIAN |
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Bio: Corresponding member of the Russian Academy of Sciences, winner of the European Mathematical Society prize (2000). |
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Lorentz geometry and contact topology.
Roger Penrose observed four decades ago that the space of light rays of a reasonable spacetime carries a natural contact structure and raised the problem of describing the causality relation of the spacetime in its terms. The talk will survey the progress made in this direction from the seminal work of Robert Low to the more recent applications of global contact rigidity.
12:00 (GMT+3)
| Wenshuai Jiang | Zhejiang University |
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Bio: Wenshuai Jiang studied in the Department of mathematics of Nanjing University from 2007 to 2011 and obtained his bachelor's degree. From 2011 to 2016, he studied in school of Mathematical Sciences of Peking University and obtained a doctorate under the guidance of Professor Gang Tian. He has been working in Zhejiang University since 2016, and is currently an associate professor of Zhejiang University. His major research interest is geometric analysis. |
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Gromov-Hausdorff limit of manifolds and some applications.
Gromov-Hausdorff distance is a distance between two metric spaces, which was introduced by Gromov 1981. From Gromov’s compactness theorem, we knew that any sequence of manifolds with uniform lower Ricci curvature bounds has a converging subsequence in Gromov-Hausdorff topology to a limit metric space. The limit metric space in general may not be a manifold. The structure of such limit metric space has been studied by Cheeger, Colding, Tian, Naber and many others since 1990. It turns out that such theory has powerful application in geometry. In fact, the resolution of Yau-Tian-Donaldson conjecture was largely relied on the development of the study of the limit metric space.
In the first part of the talk, we will discuss some recent progress of the Gromov-Hausdorff limit of a sequence of manifolds with Ricci curvature bounds. In the second part, we will discuss some applications based on the study of Gromov-Hausdorff limits.
The meeting will be held in the form of a webinar on the Zoom platform.
Pre-registration for the event is not required.
To join Zoom meeting（You can join in the meeting without a phone number):
https://zoom.com.cn/j/64938888630?pwd=ODBQcFpJSHJ2ejJ2Q29DVVBuK3NQZz09
Meeting ID : 649 3888 8630
Пароль：774874