Propagation rates in integro-differential equations of ignition type

Émeric Bouin; Jérôme Coville; Xi Zhang

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arXiv · 2608.28450

Propagation rates in integro-differential equations of ignition type

Émeric Bouin·Jérôme Coville·Xi Zhang

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Abstract

This paper provides sharp rates of invasion in nonlinear integro-differential equations of ignition type. The framework covers both integrable convolution kernels and singular fractional-type kernels. While the emergence of a threshold on the decay $1+2s$ of the jump kernel is expected from earlier works, far fewer quantitative results were available in such a general framework. In particular, in addition to the spreading rates, our study provides information on the shape of the invasion profiles. Importantly, we obtain the first sharp spreading estimate in the critical case $s=\frac12$, which separates linear-in-time and accelerated regimes.

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Émeric Bouin, Jérôme Coville, Xi Zhang. 2026-08-28. Propagation rates in integro-differential equations of ignition type. https://arxiv.org/abs/2608.28450

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