[CvGmt News] Inizio 2013-2014
Daniele Castorina
castorin at mat.uniroma2.it
Wed Sep 11 18:52:05 CEST 2013
Cari colleghi,
ricomincia la stagione dei seminari di ED a Roma 2 con il seguente
doppio appuntamento di Martedi e Giovedi:
Martedi' 24 Settembre 2013, h 14:30, Aula D' Antoni
Diogo Oliveira e Silva (Universita' di Bonn-Hausdorff Center for
Mathematics)
"On extremizers for Fourier restriction inequalities."
This talk will focus on extremizers for a family of Fourier
restriction inequalities on planar curves. It turns out that,
depending on whether or not a certain geometric condition related to
the curvature is satisfied, extremizing sequences of nonnegative
functions may or may not have a subsequence which converges to an
extremizer. We hope to describe the method of proof, which is of
concentration compactness flavor, in some detail. Tools include
bilinear estimates, a variational calculation, a modification of the
usual method of stationary phase and several explicit computations.
Giovedi' 26 Settembre 2013, h 14:30, Aula D' Antoni
Stefan Steinerberger (Universita' di Bonn-Hausdorff Center for
Mathematics)
"Heat flow methods for Laplacian eigenfunctions."
We describe a heat flow approach to study Laplacian eigenfunctions
on smooth, compact manifolds. This allows us to recover the
currently optimal lower bound on the size of the nodal set
(originally due to Colding & Minicozzi as well as Sogge & Zelditch)
and various geometric statements about nodal sets. We also
conjecture some isoperimetric statements about heat flows in
Euclidean space.
--
Daniele Castorina
Dipartimento di Matematica - Studio 1221
Università di Roma "Tor Vergata"
Via della Ricerca Scientifica 00133 Roma
email: castorin at mat.uniroma2.it
tel: +390672594653
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