On a generalization of the Bardos-Tartar conjecture for nonlinear dissipative PDEs

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• Edriss Titi (University of Cambridge)
• Friday 14 June 2024, 09:30-10:20
• Seminar Room 1, Newton Institute.

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ADIW04 - Anti-Diffusion in Multiphase and Active Flows

In this talk I will show that every solution of a KdV-Burgers-Sivashinsky type equation blows up in the energy space, backward in time, provided the solution does not belong to the global attractor. This is a phenomenon contrast to the backward behavior of the 2D Navier-Stokes equations, subject to periodic boundary condition, studied by Constantin, Foias, Kukavica and Majda, but analogous to the backward behavior of the Kuramoto-Sivashinsky equation discovered by Kukavica and Malcok. I will also discuss  the backward behavior of solutions to the damped driven nonlinear Schroedinger equation, the complex Ginzburg-Landau equation, and the hyperviscous Navier-Stokes equations. In addition, I will provide some physical interpretation of various backward behaviors of several perturbations of the KdV equation by studying explicit cnoidal wave solutions. Furthermore, I will discuss the connection between the backward behavior and the energy spectra of the solutions. The study of  backward behavior of dissipative evolution equations is motivated by a conjecture of  Bardos and Tartar which states that the solution operator of the two-dimensional Navier-Stokes equations maps the phase space into a dense subset in this space.

This talk is part of the Isaac Newton Institute Seminar Series series.

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