Whole-space eventual log-concavity and level-set geometry for the multidimensional Fisher-KPP equation
Year: 2026
Type: preprint
Abstract: We establish eventual strict log-concavity and quantitative level-set curvature bounds for the Fisher-KPP equation $u_t=Δu+u-u^2$ in $\mathbb R^N$, $N\geq2$, with nontrivial, nonnegative, smooth compactly supported initial data. Specifically, there exist $T>1$ and $c>0$ such that $D_x^2\log u(t,x)\leq-(c/t)e^{-2(\sqrt2-1)t}\mathrm{Id}$ for all $t\geq T$ and $x\in\mathbb R^N$. Consequently, after a single waiting time, the solution has exactly one critical point, which is a nondegenerate global maximizer, and every positive level set below the maximum is smooth, closed, and strictly convex with positive principal curvatures. Moreover, for levels in any fixed closed interval $K\subset(0,1)$, the principal curvatures are uniformly bounded below by $(1-C\log t/t)/(2t)$ for all sufficiently large $t$. The proof combines one-sided second angular derivative estimates for the fixed-front region, absorptive comparison in the invaded interior, leading-edge barriers and blow-up arguments through the diffusive scale, and uniform Gaussian amplitude estimates in the exterior.
Source: arXiv (Cornell University)
Authors: Liang, Xing, Zhen, Ziqi
Institution: University of Science and Technology of China
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223319377