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arXiv 1104.1271math.AP
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具有正则性增益和正则性损失扩散型项的守恒律的最优衰减率

Optimal Decay Rates to Conservation Laws with Diffusion-Type Terms of Regularity-gain and Regularity-loss

Renjun Duan, Lizhi Ruan, Changjiang Zhu

摘要:

本文研究了具有扩散型源项的非线性标量守恒律方程在整个空间$\R^n$上的Cauchy问题,其中扩散型源项与一个指数$s\in \R$有关,对任意空间维数$n\geq 1$ .这里,扩散型源项在频域上表现为通常的扩散项,而在高频部分上,它分别允许$s< 1$和$s>1$的正则性增益和正则性损失的特征。对所有$s\in \R$,我们不仅得到了线性解半群上的$L^p$ - $L^q$时间衰减估计,而且建立了非线性Cauchy问题小振幅经典解的整体存在性和最优时间衰减率.在正则性损失的情况下,引入时间加权能量方法来克服方程的弱耗散性。此外,还研究了解渐近趋向热扩散波的大时间性态。目前的结果具有普遍的应用,从物理产生的几个具体的模型。

英文摘要:

We consider the Cauchy problem on nonlinear scalar conservation laws with a diffusion-type source term related to an index $s\in \R$ over the whole space $\R^n$ for any spatial dimension $n\geq 1$. Here, the diffusion-type source term behaves as the usual diffusion term over the low frequency domain while it admits on the high frequency part a feature of regularity-gain and regularity-loss for $s< 1$ and $s>1$, respectively. For all $s\in \R$, we not only obtain the $L^p$-$L^q$ time-decay estimates on the linear solution semigroup but also establish the global existence and optimal time-decay rates of small-amplitude classical solutions to the nonlinear Cauchy problem. In the case of regularity-loss, the time-weighted energy method is introduced to overcome the weakly dissipative property of the equation. Moreover, the large-time behavior of solutions asymptotically tending to the heat diffusion waves is also studied. The current results have general applications to several concrete models arising from physics.

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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