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arXiv 1402.4685math.AP
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一般耗散系统在Besov空间框架下的最优衰减估计

The optimal decay estimates on the framework of Besov spaces for generally dissipative systems

Jiang Xu, Shuichi Kawashima

摘要:

我们给出了一般耗散双曲系统和双曲-抛物组合系统的一个新的衰减框架,与以往的工作相比,这使得我们可以减少对传统谱分析的关注.新的成分在于高频和低频分解的伪微分算子和插值不等式有关的齐次Besov空间的负阶。在空间临界Besov空间框架下,我们发展了Littlewood-Paley点态能量估计和新的时间加权能量泛函,建立了退化耗散双曲平衡律系统的最优衰减估计.基于$L^{p}(\mathbb{R}^{n})$嵌入和改进的Gagliardo-Nirenberg不等式,进一步给出了最优的$L^{2}(\mathbb{R}^{n})(1\leq p<2)$衰减率和$L^{p}(\mathbb{R}^{n})$ - $L^{q}(\mathbb{R}^{n})(1\leq p<2\leq q\leq\infty)$衰减率.最后,作为一个直接的应用,三维阻尼可压缩欧拉方程的最佳衰减率也得到了。

英文摘要:

We give a new decay framework for general dissipative hyperbolic system and hyperbolic-parabolic composite system, which allow us to pay less attention on the traditional spectral analysis in comparison with previous efforts. New ingredients lie in the high-frequency and low-frequency decomposition of a pseudo-differential operator and an interpolation inequality related to homogeneous Besov spaces of negative order. Furthermore, we develop the Littlewood-Paley pointwise energy estimates and new time-weighted energy functionals to establish the optimal decay estimates on the framework of spatially critical Besov spaces for degenerately dissipative hyperbolic system of balance laws. Based on the $L^{p}(\mathbb{R}^{n})$ embedding and improved Gagliardo-Nirenberg inequality, the optimal $L^{p}(\mathbb{R}^{n})$-$L^{2}(\mathbb{R}^{n})(1\leq p<2)$ decay rates and $L^{p}(\mathbb{R}^{n})$-$L^{q}(\mathbb{R}^{n})(1\leq p<2\leq q\leq\infty)$ decay rates are further shown. Finally, as a direct application, the optimal decay rates for 3D damped compressible Euler equations are also obtained.

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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