Uniqueness of the weak solutions of the Yang-Mills flow in four dimensions

Abstract

We improve a parabolic version of Uhlenbeck's gauge fixing theorem for the Yang-Mills flow. This allows us to prove new existence of weak solutions of the Yang-Mills flow having with better properties than Struwe's weak solution on four manifolds in \cite {St2}. Finally, we apply the new parabolic version of Uhlenbeck's gauge fixing theorem to solve the Struwe problem in \cite {St2} and prove uniqueness of weak solutions to the Yang-Mills flow on compact four-manifolds with initial value $A_0 \in W^{1, 2}(M)$.