The $L^1$ gradient flow of a generalized scale invariant Willmore energy for radially non increasing functions

François Dayrens

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arXiv · 1411.3951

The $L^1$ gradient flow of a generalized scale invariant Willmore energy for radially non increasing functions

François Dayrens

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Abstract

We use the minimizing movement theory to study the gradient flow associated with a non-regular relaxation of a geometric functional derived from the Willmore energy. Thanks to the coarea formula, one can define a Willmore energy on regular functions of L 1 (R d). This functional is extended to every L 1 function by taking its lower semi-continuous envelope. We study the flow generated by this relaxed energy for radially non-increasing functions, i.e. functions with balls as level sets. In the first part of the paper, we prove a coarea formula for the relaxed energy of such functions. Then we show that the flow consists on an erosion of the initial data. The erosion speed is given by a first order ordinary equation.

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François Dayrens. 2016-07-06. The $L^1$ gradient flow of a generalized scale invariant Willmore energy for radially non increasing functions. https://arxiv.org/abs/1411.3951

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