Title: Non-uniqueness of Leray solutions of the forced Navier-Stokes equations,
Speaker(s): Elia Bruč, Institute for Advanced Study (Princeton),
Date and time: 28 Jun 2022, 16:30 (Europe/Rome),
Lecture series: Analysis Seminar,
Venue: Dipartimento di Matematica (Aula Magna).
You can access the full event here:
https://events.dm.unipi.it/e/100
Abstract
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In his seminal work, Leray demonstrated the existence of global weak solutions, with nonincreasing energy, to the Navier-Stokes equations in three dimensions. In this talk, we exhibit two distinct Leray solutions with zero initial velocity and identical body
force. Building on a recent work of Vishik, we construct a linear unstable self-similar solution to the 3D Navier-Stokes with force. We employ the linear instability of the latter to build the second solution, which is a trajectory on the unstable manifold,
in accordance with the predictions of Jia and verįk.
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