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arXiv 1908.10111math.AP
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单调约束下梯度流的弱解

Weak solutions for gradient flows under monotonicity constraints

Matteo Negri, Masato Kimura

摘要:

在时间单调性约束和自然正则性假设下,研究了二次非自治能量的梯度流。我们首先提供了一个弱解的概念,启发理论的曲线的最大斜率,然后存在性(采用时间离散计划与不同的“实现”的约束),唯一性,电源和能量恒等式,比较原则和连续依赖。作为一个副产品,我们表明,能量恒等式给出了一个选择标准的(非唯一的)演化得到的其他概念的解决方案。我们最后表明,自治的能量,单调性约束下得到的解决方案实际上与固定的障碍,给定的初始数据。

英文摘要:

We consider the gradient flow of a quadratic non-autonomous energy under monotonicity constraint in time and natural regularity assumptions. We provide first a notion of weak solution, inspired by the theory of curves of maximal slope, and then existence (employing time-discrete schemes with different "implementations" of the constraint), uniqueness, power and energy identity, comparison principle and continuous dependence. As a byproduct, we show that the energy identity gives a selection criterion for the (non-unique) evolutions obtained by other notions of solutions. We finally show that, for autonomous energies, the solutions obtained with the monotonicity constraint actually coincide with those obtained with a fixed obstacle, given by the initial datum.

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