# Geometric Analysis and Topology Seminar

#### Rigidity Results for Conformal Immersions in R^N

**Speaker:**
Tobias Lamm, Frankfurt

**Location:**
Warren Weaver Hall 512

**Date:**
Friday, March 2, 2012, 11 a.m.

**Synopsis:**

By a classical result of Codazzi every closed, totally umbilic surface in \(R^n\) is a round sphere. De Lellis and Muller proved a rigidity statement corresponding to this result. More precisely, they showed that for every closed surface in \(R^3\), whose traceless second fundamental form is "small" in \(L^2\), there exists a conformal parametrization whose distance to a standard parametrization of a round sphere is small in \(W^{2,2}\). In a recent joint work with H. Nguyen (Warwick) we were able to extend this result to arbitrary codimensions. Moreover, we obtained related rigidity results for inversions of the catenoid and Enneper's minimal surface. In my talk I will review the analytic preliminaries (i.e. the results of Muller-Sverak and Kuwert-Li) and I will sketch the proof of the above mentioned results.