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arXiv 2009.12940math.AP
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硬势齐次Landau方程的稳定性、适定性适定性和正则性

Stability, well-posedness and regularity of the homogeneous Landau equation for hard potentials

Nicolas Fournier, Daniel Heydecker

摘要:

我们建立了硬势空间齐次Landau方程的适定性和一些定量稳定性,使用一些特定的Monge-Kantorovich成本,仅假设初始条件是一个概率测度,具有有限阶$p$的某些$p>2$。因此,我们扩展了以前的正则性结果,并表明,所有非退化的朗道方程的测度值的解决方案,具有有限的初始能量,立即承认分析密度有限熵。一路上,我们证明了朗道方程瞬间创建高斯矩。在有限初始能量的假设下,我们还证明了该方程的弱解的存在性。

英文摘要:

We establish the well-posedness and some quantitative stability of the spatially homogeneous Landau equation for hard potentials, using some specific Monge-Kantorovich cost, assuming only that the initial condition is a probability measure with a finite moment of order $p$ for some $p>2$. As a consequence, we extend previous regularity results and show that all non-degenerate measure-valued solutions to the Landau equation, with a finite initial energy, immediately admit analytic densities with finite entropy. Along the way, we prove that the Landau equation instantaneously creates Gaussian moments. We also show existence of weak solutions under the only assumption of finite initial energy.

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