Asymptotic stability of homogeneous solutions to Navier-Stokes equations under $L^{p}$-perturbations

Abstract: It is known that there has been classified for all $(-1)$-homogeneous axisymmetric no-swirl solutions of the three-dimensional Navier-Stokes equations with a possible singular ray. The main purpose of this paper is to show that the least singular solutions among such solutions other than Landau solutions to the Navier-Stokes equations are asymptotically stable under $L^{3}$-perturbations. Moreover, we establish the $L^{q}$ decay estimate with an explicit decay rate and a sharp constant for any $q>3$. For that purpose, we first study the global well-posedness of solutions to the perturbed equations under small initial data in $L_{\sigma}^{3}$ space and the local well-posedness with any initial data in $L_{\sigma}^{p}$ spaces for $p\geq3$.