Sound of an anti-de Sitter manifold. (opening lecture). Inaugural Day of the French-Kazakhstan school of Mathematics. (online), 25 June 2021.

How local geometric structure affects the global nature of manifolds?

The local to global study of geometries was a major trend of 20th century geometry, with remarkable developments achieved particularly in Riemannian geometry.

In contrast, in areas such as Lorentz geometry, familiar to us as the space-time of relativity theory, and more generally in pseudo-Riemannian geometry of general signature, surprising little has been known about global properties of the geometry until recently even if we impose a locally homogeneous structure.

I plan to dicuss this active area in both geometry and analysis, and illustrate new problems and methods by an example of three-dimensional anti-de Sitter manifolds.

[ program (pdf) ]

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© Toshiyuki Kobayashi