BOUNDED WEAK SOLUTIONS TO THE THIN FILM MUSKAT PROBLEM VIA AN INFINITE FAMILY OF LIAPUNOV FUNCTIONALS
Résumé
A countably infinite family of Liapunov functionals is constructed for the thin film Muskat problem, which is a second-order degenerate parabolic system featuring cross-diffusion. More precisely, for each n ≥ 2 we construct an homogeneous polynomial of degree n, which is convex on [0, ∞)^2 , with the property that its integral is a Liapunov functional for the problem. Existence of global bounded non-negative weak solutions is then shown in one space dimension.
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