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arXiv 2109.12447math.APmath.DGmath.FA
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有界变差时空积分流

Space-time integral currents of bounded variation

Filip Rindler

摘要:

受最近的弹塑性演化模型驱动的流动的位错,这项工作开发了一个理论的时空积分电流有界变化的时间,这使得一个自然的变分方法来分析率无关的几何演化。在此基础上,我们进一步引入积分电流之间的Lipschitz变形距离的概念,它在物理上作为(简化的)耗散距离出现。获得了几个结果:一个Helly型紧性定理,一个形变定理,一个等周不等式,以及形变距离收敛与弱 *(或平坦)收敛的等价性.最后,我们证明了Lipschitz变形距离同意(积分)齐次惠特尼平坦度量无边界电流。物理上,这意味着两种看似不同的测量耗散的方法实际上是一致的。

英文摘要:

Motivated by a recent model for elasto-plastic evolutions that are driven by the flow of dislocations, this work develops a theory of space-time integral currents with bounded variation in time, which enables a natural variational approach to the analysis of rate-independent geometric evolutions. Based on this, we further introduce the notion of Lipschitz deformation distance between integral currents, which arises physically as a (simplified) dissipation distance. Several results are obtained: A Helly-type compactness theorem, a deformation theorem, an isoperimetric inequality, and the equivalence of the convergence in deformation distance with the classical notion of weak* (or flat) convergence. Finally, we prove that the Lipschitz deformation distance agrees with the (integral) homogeneous Whitney flat metric for boundaryless currents. Physically, this means that two seemingly different ways to measure the dissipation actually coincide.

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