# Seminars & Events for Differential Geometry & Geometric Analysis Seminar

April 22, 2011
4:00pm - 6:00pm
##### The Yamabe problem for the conformal fractional Laplacian
###### Differential Geometry & Geometric Analysis Seminar

Based on the relations between scattering operators of asymptotically hyperbolic metrics and Dirichlet-to-Neumann operators of uniformly degenerate elliptic boundary value problems, we formulate fractional Yamabe problems that include the boundary Yamabe problem studied by Escobar. We observe an interesting Hopf type maximum principle together with interplays between analysis of weighted trace Sobolev inequalities and conformal structure of the underlying manifolds, which extend the phenomena displayed in the classic Yamabe problem and boundary Yamabe problem. This is joint work with J. Qing.

Speaker: Maria del Mar Gonzalez, Universitat Politècnica de Catalunya
Location:
Fine Hall 314
April 29, 2011
3:00pm - 5:00pm
##### Parabolic equations and the Ricci flow on manifolds with boundary
###### Differential Geometry & Geometric Analysis Seminar

In the first part of the talk, we will focus on a second-order quasilinear parabolic equation in a vector bundle over a compact manifold~$M$ with boundary. Our goal is to explore the short-time existence of solutions to this equation. In the second part, we will discuss the Ricci flow on~$M$. The objective is to propose a new boundary condition for the flow and state two short-time existence results.

Speaker: Artem Pulemotov, University of Chicago
Location:
Fine Hall 314
May 6, 2011
3:00pm - 5:00pm
##### Geometry of level sets of elliptic equations and a conjecture of De Giorgi
###### Differential Geometry & Geometric Analysis Seminar

I will describe recent results on the rigidity of level sets of solutions of local and non local elliptic equations on the euclidean space and on riemannian manifolds in connection with a conjecture by De Giorgi.

Speaker: Yannick Sire, Universite de Aix-Marseille III
Location:
Fine Hall 314