On the uniqueness and the regularity of solutions to the Navier Stokes in the Lorentz space $L^{3,\infty }({\mathbb{R}}^3)$

Abstract

We prove uniqueness of solutions to the Navier-Stokes equations in the space \[ L^p\bigl([0,T],\widetilde{L}^{3,\infty}(\mathbb{R}^3)\bigr) \cap C\bigl([0,T],B^{-1,\infty}_{\infty}(\mathbb{R}^3)\bigr), \qquad p>2, \] where ${\tilde{L}}^{3,\infty }({\mathbb{R}}^3)$ denotes the closure of the Schwartz space $\mathcal{S}({\mathbb{R}}^3)$ in the Lorentz space $L^{3,\infty }({\mathbb{R}}^3)$. Moreover, we prove that any solution $u$ in this class, if it exists, is smooth for positive time, namely, $u\in C^{\infty }((0,T]\times {\mathbb{R}}^3)$. In addition, we establish precise estimates for the behavior of $u(t)$ as $t\to 0^{+}$ in various Banach spaces.

arXiv comment21 pages