Asymptotic Behavior for the Discrete in Time Heat Equation

Luciano Abadias and Edgardo Alvarez ()
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Luciano Abadias: Departamento de Matemáticas, Instituto Universitario de Matemáticas y Aplicaciones, Universidad de Zaragoza, 50009 Zaragoza, Spain
Edgardo Alvarez: Departamento de Matemáticas y Estadística, Universidad del Norte, Barranquilla 080001, Colombia

Mathematics, 2022, vol. 10, issue 17, 1-22

Abstract: In this paper, we investigate the asymptotic behavior and decay of the solution of the discrete in time N -dimensional heat equation. We give a convergence rate with which the solution tends to the discrete fundamental solution, and the asymptotic decay, both in L p ( R N ) . Furthermore, we prove optimal L 2 -decay of solutions. Since the technique of energy methods is not applicable, we follow the approach of estimates based on the discrete fundamental solution which is given by an original integral representation and also by MacDonald’s special functions. As a consequence, the analysis is different to the continuous in time heat equation and the calculations are rather involved.

Keywords: discrete heat equation; large-time behavior; decay of solutions; discrete fundamental solution (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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