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arXiv 1906.09856math.AP
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梯度流型非线性齐次发展方程的渐近解

Asymptotic Profiles of Nonlinear Homogeneous Evolution Equations of Gradient Flow Type

Leon Bungert, Martin Burger

摘要:

本文研究了Hilbert空间上的绝对$p$ -齐次凸泛函的梯度流,证明了它具有有限($p<2$)或无限消亡时($p \geq 2$).我们给出了有限消亡时的上界,并建立了流的收敛速度。此外,我们还研究了解的次阶渐近性,证明了解的渐近轮廓是泛函的次微分算子的本征函数。为此,我们比较了一个常微分方程的解决方案,它描述了本征函数的流动下的演变。例如,我们的工作适用于局部和非局部版本的偏微分方程,如$p$ -拉普拉斯发展方程,多孔介质方程,快速扩散方程,从而推广了许多结果从文献到一个抽象的设置。我们还展示了我们的理论如何扩展到一般的齐次发展方程,这不一定是一个梯度流。在这里,我们发现了一个有趣的可积性条件的特点是否渐近配置文件是本征函数。

英文摘要:

This work is concerned with the gradient flow of absolutely $p$-homogeneous convex functionals on a Hilbert space, which we show to exhibit finite ($p<2$) or infinite extinction time ($p \geq 2$). We give upper bounds for the finite extinction time and establish convergence rates of the flow. Moreover, we study next order asymptotics and prove that asymptotic profiles of the solution are eigenfunctions of the subdifferential operator of the functional. To this end, we compare with solutions of an ordinary differential equation which describes the evolution of eigenfunction under the flow. Our work applies, for instance, to local and nonlocal versions of PDEs like $p$-Laplacian evolution equations, the porous medium equation, and fast diffusion equations, herewith generalizing many results from the literature to an abstract setting. We also demonstrate how our theory extends to general homogeneous evolution equations which are not necessarily a gradient flow. Here we discover an interesting integrability condition which characterizes whether or not asymptotic profiles are eigenfunctions.

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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