Seminari di Analisi @ Unife - The effects of flux-saturated diffusion on indefinite logistic-growth models

Giovedì 13 maggio 2021
Ore 16.00
Elisa Sovrano (EHESS-CAMS-CNRS Paris)

Title:
The effects of flux-saturated diffusion on indefinite logistic-growth models

Abstract:
Reaction-diffusion processes can be based on Fick-Fourier's law. Changing perspective, we deal with a dispersive flux which is a nonlinear bounded function of the gradient. In a bounded domain with a regular boundary, we investigate a Dirichlet problem associated with a quasilinear reaction-diffusion equation where the mean curvature operator drives the diffusion process. As for the reaction, we consider the product of a logistic-type nonlinearity and a sign-changing weight function modeling spatial heterogeneities. For this problem, we present some recent results concerning the existence and the multiplicity of positive solutions. Depending on the logistic term's behavior at zero, we prove three qualitatively different bifurcation diagrams by varying the diffusivity parameter. We point out a new multiplicity phenomenon without any similarity with the case of linear-diffusion logistic-growth models.
This talk is based on joint works with Pierpaolo Omari (University of Trieste).

Il seminario si terra’ in modalità’ telematica e il codice meet per collegarsi e’:

https://meet.google.com/dif-qrmm-bgy