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.
Mots-clés : Wasserstein-Fisher-Rao, Hellinger-Kantorovich, gradient flow, tumor growth model
@article{COCV_2020__26_1_A103_0, author = {Di Marino, Simone and Chizat, L\'ena{\"\i}c}, 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}, doi = {10.1051/cocv/2020019}, mrnumber = {4185055}, zbl = {1460.92050}, language = {en}, url = {http://www.numdam.org/articles/10.1051/cocv/2020019/} }
TY - JOUR AU - Di Marino, Simone AU - Chizat, Lénaïc TI - A tumor growth model of Hele-Shaw type as a gradient flow JO - ESAIM: Control, Optimisation and Calculus of Variations PY - 2020 VL - 26 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/cocv/2020019/ DO - 10.1051/cocv/2020019 LA - en ID - COCV_2020__26_1_A103_0 ER -
%0 Journal Article %A Di Marino, Simone %A Chizat, Lénaïc %T A tumor growth model of Hele-Shaw type as a gradient flow %J ESAIM: Control, Optimisation and Calculus of Variations %D 2020 %V 26 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/cocv/2020019/ %R 10.1051/cocv/2020019 %G en %F COCV_2020__26_1_A103_0
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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