### Abstract

This paper deals with a free boundary problem for diffusion equation with a certain class of bistable nonlinearity which allows two positive stable equilibrium states as an ODE model. This problem models the invasion of a biological species and the free boundary represents the spreading front of its habitat. Our main interest is to study large-time behaviors of solutions for the free boundary problem. We will completely classify asymptotic behaviors of solutions and, in particular, observe two different types of spreading phenomena corresponding to two positive stable equilibrium states. Moreover, it will be proved that, if the free boundary expands to infinity, an asymptotic speed of the moving free boundary for large time can be uniquely determined from the related semi-wave problem.

Original language | English |
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Pages (from-to) | 538-572 |

Number of pages | 35 |

Journal | Journal of Differential Equations |

Volume | 261 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2016 Jul 5 |

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### Keywords

- Comparison theorem
- Free boundary problem
- Reaction-diffusion equation
- Semi-wave
- Spreading
- Vanishing

### ASJC Scopus subject areas

- Analysis

### Cite this

*Journal of Differential Equations*,

*261*(1), 538-572. https://doi.org/10.1016/j.jde.2016.03.017