We mainly research the Liouville type problem for the stationary Navier-Stokes equations (including the fractional case) in $\mathbb{ R}^3$. We first establish a new formula for the Dirichlet integral of solutions and show that the globally defined quantity $\int_{ \mathbb{ R}^3}|\nabla u|^2dx$ is completely determined by the information of the solution $u$ at the origin in frequency space. From this character, we show some new Liouville type theorems for solutions of the stationary Navier-Stokes equations. Then we extend the obtained results for classical stationary Navier-Stokes equations to the stationary fractional Navier-Stokes equations for $\frac{ 1}{ 2}\leq s<1$, especially, we solve the Liouville type problem for $s=\frac{ 5}{ 6}$.
Categories: math.AP