On Liouiville Type Theorem for the 3D Isentropic Navier-Stokes System without D-condition

TL;DR

This paper proves Liouville-type theorems for steady compressible Navier-Stokes equations in three dimensions, removing previous boundary conditions and extending results to various function spaces.

Contribution

It generalizes Liouville theorems for the 3D steady Navier-Stokes system by removing D-condition and considering broader function spaces.

Findings

Liouville theorem holds for solutions in L^p with 3 ≤ p ≤ 9/2.

Theorems extend to solutions in Morrey-type spaces.

Results include cases with oscillation conditions and BMO^{-1} spaces.

Abstract

In this paper, we establish Liouville-type theorems for the steady compressible Navier-Stokes system. Assuming a smooth solution \(u \in L^p(\mathbb{R}^3)\), \(3 \le p \le \frac{9}{2}\), with bounded density, one obtains \(u \equiv0\). This generalizes the result of Li-Yu \cite{Li-Yu} by removing the Dirichlet condition \(\int_{\mathbb{R}^3} |\nabla u|^2 \, dx < \infty\). If \(\frac{9}{2} < p < 6\), Liouville-type theorem holds under the additional oscillation condition for momentum \(\rho u \in \dot{B}^{\frac{3}{p} - \frac{3}{2}}_{\infty,\infty}(\mathbb{R}^3)\). For the marginal case \(u \in L^6(\mathbb{R}^3)\), the oscillation condition can be replaced by \(\rho u \in BMO^{-1}(\mathbb{R}^3)\). We also present results in Morrey-type spaces: \(u \in \dot{M}^{s,6}(\mathbb{R}^3)\) and \(\rho u \in \dot{M}_w^{q,3}(\mathbb{R}^3)\) for \(2 \le s \le 6\) and \(\frac{3}{2} < q \le 3\).