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arXiv 2106.10985math.APcs.NAmath.NA
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时间分数阶梯度流与整数阶梯度流的等价性:能量中反映的记忆效应

Equivalence between a time-fractional and an integer-order gradient flow: The memory effect reflected in the energy

Marvin Fritz, Ustim Khristenko, Barbara Wohlmuth

摘要:

时间分数阶偏微分方程在时间上是非局部的,并且表现出固有记忆效应。在这项工作中,我们提出了一个增强的能量功能,其中包括历史的解决方案。此外,我们证明了时间分数阶梯度流问题的等价性,一个整数阶的基础上,我们的新能源。这种等价性保证了增广能量的耗散特性。整数阶梯度流的状态函数作用在一个扩展域上,类似于分数拉普拉斯算子的Caffarelli-Silvestre扩展。此外,我们还应用了一种基于核压缩方法的数值方法来求解时间分数阶梯度流。我们说明的情况下,Ginzburg-Landau能量泛函的原始和增广的能量的行为。

英文摘要:

Time-fractional partial differential equations are nonlocal in time and show an innate memory effect. In this work, we propose an augmented energy functional which includes the history of the solution. Further, we prove the equivalence of a time-fractional gradient flow problem to an integer-order one based on our new energy. This equivalence guarantees the dissipating character of the augmented energy. The state function of the integer-order gradient flow acts on an extended domain similar to the Caffarelli-Silvestre extension for the fractional Laplacian. Additionally, we apply a numerical scheme for solving time-fractional gradient flows, which is based on kernel compressing methods. We illustrate the behavior of the original and augmented energy in the case of the Ginzburg-Landau energy functional.

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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