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arXiv 1601.01441math.APmath-phmath.MP
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Sobolev-Fourier-Lorentz空间中Navier-斯托克斯方程解的适定性

Well-posedness for the Navier-Stokes equations with datum in Sobolev-Fourier-Lorentz spaces

D. Q. Khai, N. M. Tri

摘要:

本文对$s \in \mathbb R$和$1 \leq p, r \leq \infty$引入并研究了Sobolev-Fourier-Lorentz空间$\dot{H}^s_{\mathcal{L}^{p, r}}(\mathbb{R}^d)$ .在族空间$\dot{H}^s_{\mathcal{L}^{p, r}}(\mathbb{R}^d)$中,Navier-斯托克斯方程的临界不变空间对应于值$s = \frac{d}{p} - 1$ .当初始数据属于临界空间$\dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p,r}}(\mathbb{R}^d)$,$d \geq 2, 1 \leq p <\infty$和$1 \leq r < \infty$时,我们建立了Navier-斯托克斯方程的Cauchy问题在具有任意初值的$L^\infty([0, T]; \dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p, r}}(\mathbb{R}^d))$空间中局部温和解的存在性,以及当Besov空间$\dot{B}^{\frac{d}{\tilde p} - 1, \infty}_{\mathcal{L} ^{\tilde p,\infty}}(\mathbb{R}^d)$中的初值范数足够小时,在$L^\infty([0, \infty); \dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p, r}}(\mathbb{R}^d))$空间中整体温和解的存在性,其中$\tilde p$可以取适当的值.

英文摘要:

In this note, for $s \in \mathbb R$ and $1 \leq p, r \leq \infty$, we introduce and study Sobolev-Fourier-Lorentz spaces $\dot{H}^s_{\mathcal{L}^{p, r}}(\mathbb{R}^d)$. In the family spaces $\dot{H}^s_{\mathcal{L}^{p, r}}(\mathbb{R}^d)$, the critical invariant spaces for the Navier-Stokes equations correspond to the value $s = \frac{d}{p} - 1$. When the initial datum belongs to the critical spaces $\dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p,r}}(\mathbb{R}^d)$ with $d \geq 2, 1 \leq p <\infty$, and $1 \leq r < \infty$, we establish the existence of local mild solutions to the Cauchy problem for the Navier-Stokes equations in spaces $L^\infty([0, T]; \dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p, r}}(\mathbb{R}^d))$ with arbitrary initial value, and existence of global mild solutions in spaces $L^\infty([0, \infty); \dot{H}^{\frac{d}{p} - 1}_{\mathcal{L}^{p, r}}(\mathbb{R}^d))$ when the norm of the initial value in the Besov spaces $\dot{B}^{\frac{d}{\tilde p} - 1, \infty}_{\mathcal{L} ^{\tilde p,\infty}}(\mathbb{R}^d)$ is small enough, where $\tilde p$ may take some suitable values.

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