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arXiv 1503.05145math.AP
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粘性Burgers方程强解的整体存在性。(1)有界情况

Global existence for strong solutions of viscous Burgers equation. (1) The bounded case

Jeremie Unterberger

摘要:

我们证明了粘性Burgers方程在所有维度上都有一个全局定义的光滑解,只要初始条件和强迫项是光滑的,并且它们的导数是有界的。这样的解决方案可能具有无限的能量。证明并不依赖于能量估计,而是结合了最大值原理和定量的Schauder估计。我们得到精确的上限上的解决方案及其衍生物的范数,使它简单地说,没有指数增长的时间。特别是,这些边界是时间无关的,如果强制项为零。为了得到一个经典解,只要假设初始条件和强迫项具有二阶有界导数即可。

英文摘要:

We prove that the viscous Burgers equation has a globally defined smooth solution in all dimensions provided the initial condition and the forcing term are smooth and bounded together with their derivatives. Such solutions may have infinite energy. The proof does not rely on energy estimates, but on a combination of the maximum principle and quantitative Schauder estimates. We obtain precise bounds on the sup norm of the solution and its derivatives, making it plain that there is no exponential increase in time. In particular, these bounds are time-independent if the forcing term is zero. To get a classical solution, it suffices to assume that the initial condition and the forcing term have bounded derivatives up to order two.

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