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Math Calendar

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October 17, 2024 (Thursday), 4:10 am

Colloquium

Talk by Darren Creutz and Mike Neamtu

Darren Creutz, Vanderbilt University
Mike Neamtu, Vanderbilt University

Abstract tba

October 18, 2024 (Friday), 3:30 pm

PDE Seminar

Title: Construction of multi-soliton solutions for semilinear equations in dimension 3- Location: Sony Building, A1013

Istvan Kadar, Princeton University

The existence of multi black hole solutions in asymptotically flat spacetimes is one of the expectation from the final state conjecture. In this talk, I will present preliminary works in this direction via a semilinear toy model in dimension 3. In particular, I show 1) an algorithm to construct approximate solutions to the energy critical wave equation that converge to a sum of solitons at an arbitrary polynomial rate in (t-r); 2) a robust method to solve the remaining error terms for the nonlinear equation. The methods apply to energy supercritical problems.

October 24, 2024 (Thursday), 4:10 pm

Colloquium

Curve graphs and totally geodesic subvarieties of moduli spaces of Riemann surfaces- Location – TBD

Alex Wright- University of Michigan

Given a surface, the associated curve graph has vertices corresponding to certain isotopy classes of curves on the surface, and edges for disjoint curves. Starting with work of Masur and Minsky in the late 1990s, curve graphs became a central tool for understanding objects in low dimensional topology and geometry. Since then, their influence has reached far beyond what might have been anticipated. Part of the talk will be an expository account of this remarkable story. Much more recently, non-trivial examples of totally geodesic subvarieties of moduli spaces have been discovered, in work of McMullen-Mukamel-Wright and Eskin-McMullen-Mukamel-Wright. Part of the talk will be an expository account of this story and its connections to dynamics.
The talk will conclude with new joint work with Francisco Arana-Herrera showing that the geometry of totally geodesic subvarieties can be understood using curve graphs, and that this is closely intertwined with the remarkably rigid structure of these varieties witnessed by the boundary in the Deligne-Mumford compactification

October 31, 2024 (Thursday), 4:10 pm

Colloquium

Detection and characterization of chirps and oscillating  singularities in data: multivariate multifractal  techniques

Stephane Jaffard- University Paris Est Creteil

Many types of signals display a very oscillatory behavior in the neighborhood of singularities. It is for example the case for gravitational waves, fully developed turbulence, or brain data. A major issue is to detect such behaviors (referred to as “oscillating singularities” or “chirps”) which are the signature of important physical phenomena. We will show how a multivariate multifractal analysis based on wavelet methods allows to meet these challenges.

 

 

 

November 1, 2024 (Friday), 3:30 pm

PDE Seminar

Title- TBA – Location- TBA

Misha Perepelitsa, University of Houston

Abstract: TBA

 

November 7, 2024 (Thursday), 4:10 pm

Colloquium

Talk by Jean-Francois Paquet

Jean-Francois Paquet, Vanderbilt University

Abstract tba

November 22, 2024 (Friday), 4:10 pm

Colloquium

Talk by Dick Canary

Dick Canary

Abstract tba