A quantitative modulus of continuity for the two-phase Stefan problem

We derive the quantitative modulus of continuity $ω(r)=\left[ p+\ln \left( \frac{r_0}{r} \right) \right]^{-α(n,p)},$ which we conjecture to be optimal, for solutions of the $p$-degenerate two-phase Stefan problem. Even in the classical case $p=2$, this represents a twofold improvement with respect to the 1984 state-of-the-art result by DiBenedetto and Friedman [J. reine angew. Math., 1984], in the sense that we discard one logarithm iteration and obtain an explicit value for the exponent $α(n,p)$.

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