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arXiv 2402.07508math.AP
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关于变指数Lebesgue空间与分数阶Navier-Stokes方程的注记

Remarks on variable Lebesgue spaces and fractional Navier-Stokes equations

Gastón Vergara-Hermosilla

AI总结:

该研究从变指数Lebesgue空间视角研究带分数阶拉普拉斯扩散项的三维Navier-Stokes方程,借助分数阶热核衰减估计证明温和解的存在唯一性,得到局部与全局时间解的相关结果。

摘要:

本文从变指数Lebesgue空间的视角,研究了受外力作用且扩散项含分数阶拉普拉斯算子$(-Δ)^α$的三维Navier-Stokes方程。基于分数阶热核的衰减估计,我们证明了该函数框架下温和解的存在性与唯一性。第一个定理得到了空间$L^{p(\cdot)} \bigl( [0,T], L^{q} (\real^3) \bigr)$中的唯一局部时间解。作为附带结果,第二个定理证明了混合空间$\bigl.\n\bbl^{p(\frac{3}{2α-1}}{\real^3,L^\ty([0,T[))$中唯一全局时间解的存在性。

英文摘要:

In this work we study the 3D Navier-Stokes equations, under the action of an external force and with the fractional Laplacian operator $(-Δ)^α$ in the diffusion term, from the point of view of variable Lebesgue spaces. Based on decay estimates of the fractional heat kernel we prove the existence and uniqueness of mild solutions on this functional setting. Thus, in a first theorem we obtain an unique local-in-time solution in the space $L^{p(\cdot)} \left( [0,T], L^{q} (\mathbb{R}^3) \right)$. As a bi-product, in a second theorem we prove the existence of an unique global-in-time solution in the mixed-space $\mathcal{L}^{p(\cdot)}_{\frac{3}{2α-1}}(\mathbb{R}^3,L^\infty([0,T[))$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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