Nonlinear Porous Medium Flow with Fractional Potential Pressure

Abstract

We study a porous medium equation with nonlocal diffusion effects given by an inverse fractional Laplacian operator:

$$\partial_t u-\nabla\cdot(u\nabla p)=0, \quad p=(-\Delta)^{-s}u,\quad 0 < s < 1.$$

We pose the problem for \({x\in {\mathbb{R}^n}}\) and t > 0 with bounded and compactly supported initial data, and prove the existence of weak and bounded solutions that propagate with finite speed, a property that is not shared by other fractional diffusion models.

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Correspondence to Luis Caffarelli.

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Communicated by F. Lin

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Caffarelli, L., Vazquez, J.L. Nonlinear Porous Medium Flow with Fractional Potential Pressure. Arch Rational Mech Anal 202, 537–565 (2011). https://doi.org/10.1007/s00205-011-0420-4

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Keywords

  • Porous Medium
  • Weak Solution
  • Contact Point
  • Obstacle Problem
  • Energy Inequality