Seminar Calendar
for events the day of Friday, February 17, 2012.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Friday, February 17, 2012

Harmonic Analysis and Differential Equations
1:00 pm   in 343 Altgeld Hall,  Friday, February 17, 2012
 Del Edit Copy
Submitted by verahur.
 Mat Johnson (University of Kansas)Stability of Periodic Wave Trains in a Kuramoto-Sivashinsky EquationAbstract: (NOTE UNUSUAL DATE AND TIME) In this talk, we consider the spectral and nonlinear stability of periodic traveling wave solutions of a dispersion modified Kuramoto-Sivashinsky equation modeling viscous thin film flow down an inclined plane. In special cases, it has been known (with varying levels of rigor) since 1976 that, when subject to weak localized perturbations, spectrally stable solutions of this form exist. Although numerical time evolution studies indicate that these waves should also be nonlinearly stable to such perturbations, an analytical verification of this result has only recently been provided. In this talk, I will discuss a nonlinear stability theory for such spectral stability periodic wave trains, as well as the numerical and analytical verification of the required spectral stability and structural hypothesis of this theorem in particular canonical limits of dispersion/dissipation. This is joint work with Blake Barker and Kevin Zumbrun (Indiana University), as well as Pascal Noble and L. Miguel Rodrigues (University of Lyon I).

Logic Seminar
4:00 pm   in 347 Altgeld Hall,  Friday, February 17, 2012
 Del Edit Copy
Submitted by ssolecki.
 Kostya Slutsky (UIUC)Two-sided invariant metrics on HNN extensionsAbstract: We discuss some technical properties of the Graev metrics on the free products of groups with two-sided invariant metrics and will sketch the construction of the the two-sided invariant metrics on HNN extensions of groups of bounded diameter.