15
Dec

## Prof. Gerd Schmalz (UNE / Max-Planck-Institute Bonn): Rigid CR-spheres

Academic or specialist Colloquium / Congress / Forum
15.12.2015 17:15
Onsite

Spheres serve in different geometries as the most symmetric models. In CR-geometry a sphere is given by the equation Im $w= |z|^2$ (which is essentially equivalent to $|z|^2+|w|^2=1$). In this geometry the sphere has an 8-dimensional family of fractional-linear transformations of the ambient space. Choosing one symmetry out of a 7-dimensional subfamily gives the sphere the additional structure of a Sasaki manifold with a canonical embedding into $C^2$.
In my talk I will answer the question, posed by N. Stanton, how many such embeddings exist. This is joint work with V. Ezhov.

When? 15.12.2015 17:15 PER 08 Phys 2.52Chemin du Musée 31700 Fribourg Department of Mathematicsisabella.schmutz@unifr.ch
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