Semigroup theory and asymptotic profiles of solutions for a higher-order Fisher-KPP problem in R^N

Date

2023-01-16

Authors

Diaz Palencia, Jose Luis

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Publisher

Texas State University, Department of Mathematics

Abstract

We study a reaction-diffusion problem formulated with a higher-order operator, a non-linear advection, and a Fisher-KPP reaction term depending on the spatial variable. The higher-order operator induces solutions to oscillate in the proximity of an equilibrium condition. Given this oscillatory character, solutions are studied in a set of bounded domains. We introduce a new extension operator, that allows us to study the solutions in the open domain RN, but departing from a sequence of bounded domains. The analysis about regularity of solutions is built based on semigroup theory. In this approach, the solutions are interpreted as an abstract evolution given by a bounded continuous operator. Afterward, asymptotic profiles of solutions are studied based on a Hamilton-Jacobi equation that is obtained with a single point exponential scaling. Finally, a numerical assessment, with the function bvp4c in Matlab, is introduced to discuss on the validity of the hypothesis.

Description

Keywords

Higher order diffusion, Semigroup theory, Fisher-KPP equation, Hamilton-Jacobi equation

Citation

Díaz Palencia, J. L. (2023). Semigroup theory and asymptotic profiles of solutions for a higher-order Fisher-KPP problem in R^N. <i>Electronic Journal of Differential Equations, 2023</i>(04), pp. 1-17.

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Attribution 4.0 International

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