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Periodic Fisher-KPP equations on a regular tree

  • Yuanyang Hu
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Abstract

We study Fisher-KPP equations on regular trees with reactions periodic in a Busemann coordinate or in distance from a vertex or a bi-infinite geodesic. For nonzero finitely supported data, we characterize the spectral threshold between uniform extinction and persistence, including critical extinction. We establish Bramson corrections for Busemann step data at positive, zero and negative speeds and, above the periodic extinction threshold, for the largest Busemann coordinate and radial level positions of finitely supported solutions. When the periodic spectral minimum is nonpositive but the geodesic spectral threshold is positive, we construct a smallest positive stationary solution with exponential transverse decay, prove uniqueness under an exponential bound, and determine longitudinal spreading with its logarithmic correction. We also classify positive stationary solutions depending only on distance from the geodesic and prove existence and stability results for moving and stationary fronts.

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Cite

BibTeXRIS
BibTeX
@misc{hu2026periodic,
  title = {{Periodic Fisher-KPP equations on a regular tree}},
  author = {Yuanyang Hu},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.01842},
  eprint = {2611.01842},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.01842},
}
RIS
TY  - UNPB
TI  - Periodic Fisher-KPP equations on a regular tree
AU  - Yuanyang Hu
PY  - 2026
DA  - 2026/11/01
PB  - arXiv
DO  - 10.48550/arxiv.2611.01842
UR  - https://arxiv.org/abs/2611.01842
AB  - We study Fisher-KPP equations on regular trees with reactions periodic in a Busemann coordinate or in distance from a vertex or a bi-infinite geodesic. For nonzero finitely supported data, we characterize the spectral threshold between uniform extinction and persistence, including critical extinction. We establish Bramson corrections for Busemann step data at positive, zero and negative speeds and, above the periodic extinction threshold, for the largest Busemann coordinate and radial level positions of finitely supported solutions. When the periodic spectral minimum is nonpositive but the geodesic spectral threshold is positive, we construct a smallest positive stationary solution with exponential transverse decay, prove uniqueness under an exponential bound, and determine longitudinal spreading with its logarithmic correction. We also classify positive stationary solutions depending only on distance from the geodesic and prove existence and stability results for moving and stationary fronts.
ER  -