Refined estimates of the propagation speed in porous medium equation of combustion type

Suying Liu; Fan Wu

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arXiv · 2605.13361

Refined estimates of the propagation speed in porous medium equation of combustion type

Suying Liu·Fan Wu

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Abstract

We are concerned with the Cauchy problem $u_{t}=(u^{m})_{xx}+f(u)$, where the nonliearity $f(u)$ is of combustion type and the initial data is compactly supported. In \cite{lou2024convergence}, among other things, the authors prove that by considering a multiple of a given initial data, there is a critical value such that the corresponding transition solution spreads at the asymptotic speed $2y_{0}\sqrt{t}[1+o(1)]\ \text{as} \ t\rightarrow\infty$, while the lower order term $o(1)$ remains unknown. In this paper, for a family of functions of combustion type, we refine the estimates of the asymptotic speed of the transition solution and provide a precise characterization of the lower order term $o(1)$. Our result also reveals that there is no unified characterization of the lower order term for general combustion type functions $f$.

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Suying Liu, Fan Wu. 2026-05-13. Refined estimates of the propagation speed in porous medium equation of combustion type. https://arxiv.org/abs/2605.13361

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