Ricci flow and the determinant of the Laplacian on noncompact surfaces
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 Pierre Albin (Paris VI Jussieu, UrbanaChampaign)
 Monday 22 November 2010, 17:0018:00
 CMS, MR5.
If you have a question about this talk, please contact Prof. Mihalis Dafermos.
The determinant of the Laplacian is an important invariant of closed
surfaces and has connections to the dynamics of geodesics, Ricci flow, and physics. Its definition is somewhat intricate as the Laplacian has infinitely many eigenvalues. I’ll explain how to extend the determinant of the Laplacian to noncompact surfaces where one has to deal with additional difficulties like continuous spectrum and divergence of the trace of the heat kernel. On surfaces (even noncompact) this determinant has a simple variation when the metric varies conformally. I’ll explain how to use Ricci flow to see that the largest value of the determinant occurs at constant curvature metrics. This is joint work with Clara Aldana and Frederic Rochon.
This talk is part of the Partial Differential Equations seminar series.
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