A tumor growth model of Hele-Shaw type as a gradient flow
ESAIM: Control, Optimisation and Calculus of Variations, Tome 26 (2020), article no. 103.

In this paper, we characterize a degenerate PDE as the gradient flow in the space of nonnegative measures endowed with an optimal transport-growth metric. The PDE of concern, of Hele-Shaw type, was introduced by Perthame et. al. as a mechanical model for tumor growth and the metric was introduced recently in several articles as the analogue of the Wasserstein metric for nonnegative measures. We show existence of solutions using minimizing movements and show uniqueness of solutions on convex domains by proving the Evolutional Variational Inequality. Our analysis does not require any regularity assumption on the initial condition. We also derive a numerical scheme based on the discretization of the gradient flow and the idea of entropic regularization. We assess the convergence of the scheme on explicit solutions. In doing this analysis, we prove several new properties of the optimal transport-growth metric, which generally have a known counterpart for the Wasserstein metric.

DOI : 10.1051/cocv/2020019
Classification : 49Q22, 47J30, 35Q92, 35K55, 76D27
Mots-clés : Wasserstein-Fisher-Rao, Hellinger-Kantorovich, gradient flow, tumor growth model 
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     title = {A tumor growth model of {Hele-Shaw} type as a gradient flow},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     publisher = {EDP-Sciences},
     volume = {26},
     year = {2020},
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     zbl = {1460.92050},
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     url = {http://www.numdam.org/articles/10.1051/cocv/2020019/}
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Di Marino, Simone; Chizat, Lénaïc. A tumor growth model of Hele-Shaw type as a gradient flow. ESAIM: Control, Optimisation and Calculus of Variations, Tome 26 (2020), article no. 103. doi : 10.1051/cocv/2020019. http://www.numdam.org/articles/10.1051/cocv/2020019/

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