Higher regularity estimates for the porous medium equation near the Heat equation

In this paper we investigate regularity aspects for solutions of the nonlinear parabolic equation $u_t= Δu^m, \quad m > 1$ usually called the porous medium equation. More precisely, we provide sharp regularity estimates for bounded nonnegative weak solutions along the free boundary $\partial\{u>0\}$, when the equation is universally close to the heat equation. As a consequence, local Lipschitz estimates are also established for this scenario.

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