paper

Blow-up of critical Besov norms at a potential Navier-Stokes singularity

arXiv:1407.4156 · doi:10.1007/s00220-016-2593-z

Abstract

We prove that if an initial datum to the incompressible Navier-Stokes equations in any critical Besov space , with , gives rise to a strong solution with a singularity at a finite time , then the norm of the solution in that Besov space becomes unbounded at time . This result, which treats all critical Besov spaces where local existence is known, generalizes the result of Escauriaza, Seregin and Sverak (Uspekhi Mat. Nauk 58(2(350)):3-44, 2003) concerning suitable weak solutions blowing up in . Our proof uses profile decompositions and is based on our previous work (Math. Ann. 355(4):1527--1559, 2013) which provided an alternative proof of the result. For very large values of , an iterative method, which may be of independent interest, enables us to use some techniques from the setting. (To appear in Communications in Mathematical Physics.)

36 pages

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