%0 Journal Article
%T Non-uniqueness of Weak Solutions to the Wave Map Problem
%A Klaus Widmayer
%J Mathematics
%D 2013
%I arXiv
%R 10.1016/j.anihpc.2014.02.001
%X In this note we show that weak solutions to the wave map problem in the energy-supercritical dimension 3 are not unique. On the one hand, we find weak solutions using the penalization method introduced by Shatah and show that they satisfy a local energy inequality. On the other hand we build on a special harmonic map to construct a weak solution to the wave map problem, which violates this energy inequality. Finally we establish a local weak-strong uniqueness argument in the spirit of Struwe which we employ to show that one may even have a failure of uniqueness for a Cauchy problem with a stationary solution. We thus obtain a result analogous to the one of Coron for the case of the heat flow of harmonic maps.
%U http://arxiv.org/abs/1310.4419v1