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arXiv · 2608.17474

Propagation phenomena in KPP-bistable periodic patchy environments

Quentin Griette·François Hamel·Mingmin Zhang·Min Zhao
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Abstract

This paper first investigates the propagation dynamics of solutions to the Cauchy problem for a one-dimensional reaction-diffusion equation in a spatially periodic environment consisting of two distinct patch types. The novelty of this work lies in the systematic analysis of a KPP-bistable heterogeneous framework. In this setting, the respective patch lengths, the linear stability of the zero solution and the positive periodic steady state, and the magnitude of the initial data play crucial roles in the long-time dynamics. We first establish persistence properties of the species, showing that uniform persistence holds when the zero steady state of the associated periodic patch model is unstable, while local persistence is obtained under additional suitable conditions. Using a dynamical systems approach, we further establish spreading properties and demonstrate the existence of pulsating traveling waves in two different cases, depending on whether the trivial solution is unstable or stable. Finally, we present two sets of sufficient conditions characterizing species extinction.

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Quentin Griette, François Hamel, Mingmin Zhang, Min Zhao. 2026-08-18. Propagation phenomena in KPP-bistable periodic patchy environments. https://arxiv.org/abs/2608.17474

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