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- W2964102765 abstract "In any number of space variables, we study the Cauchy problem related to the fourth-order degenerate diffusion equation ∂sh+∇⋅(h∇Δh)=0. This equation, derived from a lubrication approximation, also models the surface tension dominated flow of a thin viscous film in the Hele-Shaw cell. Our focus is on uniqueness of weak solutions in the “complete wetting” regime, when a zero contact angle between liquid and solid is imposed. In this case, we transform the problem by zooming into the free boundary and look at small Lipschitz perturbations of a quadratic stationary solution. In the perturbational setting, the main difficulty is to construct scale invariant function spaces in such a way that they are compatible with the structure of the nonlinear equation. Here we rely on the theory of singular integrals in spaces of homogeneous type to obtain linear estimates in these functions spaces which provide “optimal” conditions on the initial data under which a unique solution exists. In fact, this solution can be used to define a class of functions in which the original initial value problem has a unique (weak) solution. Moreover, we show that the interface between empty and wetted regions is an analytic hypersurface in time and space." @default.
- W2964102765 created "2019-07-30" @default.
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- W2964102765 date "2015-10-01" @default.
- W2964102765 modified "2023-09-24" @default.
- W2964102765 title "On uniqueness of weak solutions for the thin-film equation" @default.
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- W2964102765 doi "https://doi.org/10.1016/j.jde.2015.05.013" @default.
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