Mathematics > Analysis of PDEs
[Submitted on 1 Sep 2025
]
Title: Quadratic Growth Model with Discontinuity: A Link between Monostable and Bistable Traveling Waves
Title: 具有不连续性的二次增长模型：单稳态与双稳态行波之间的联系
Abstract: We classify traveling waves and stationary solutions of a reaction-diffusion equation arising in population dynamics with Allee-type effects. The reaction term is given by a quadratic polynomial with a discontinuity at zero, which captures finite-time extinction for sub-threshold populations. This discontinuity induces a free boundary in the wave profile, a phenomenon that distinguishes the model from the classical logistic or Allen-Cahn equations. A complete scenario is presented that connects monostable and bistable traveling waves through the wave speed parameter, thereby providing a unified framework for their dynamics.
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