%0 Journal Article %T A Liouville theorem for the planer Navier-Stokes equations with the no-slip boundary condition and its application to a geometric regularity criterion %A Yoshikazu Giga %A Pen-Yuan Hsu %A Yasunori Maekawa %J Mathematics %D 2013 %I arXiv %X We establish a Liouville type result for a backward global solution to the Navier-Stokes equations in the half plane with the no-slip boundary condition. No assumptions on spatial decay for the vorticity nor the velocity field are imposed. We study the vorticity equations instead of the original Navier-Stokes equations. As an application, we extend the geometric regularity criterion for the Navier-Stokes equations in the three-dimensional half space under the no-slip boundary condition. %U http://arxiv.org/abs/1310.6471v1