Upper and lower bounds for the speed of fronts of the reaction diffusion equation with Stefan boundary conditions

We establish two integral variational principles for the spreading speed of the one dimensional reaction diffusion equation with Stefan boundary conditions. The first principle is valid for monostable reaction terms and the second principle is valid for arbitrary reaction terms. These principles all...

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Bibliographic Details
Published in:Nonlinearity 2023-08, Vol.36 (8), p.4425-4437
Main Authors: Benguria, R D, Depassier, M C
Format: Article
Language:English
Subjects:
35A15
35K57
35R37
80A22
nonlinear reaction diffusion
Stefan boundary condition
traveling waves
variational characterization
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Summary:We establish two integral variational principles for the spreading speed of the one dimensional reaction diffusion equation with Stefan boundary conditions. The first principle is valid for monostable reaction terms and the second principle is valid for arbitrary reaction terms. These principles allow to obtain several upper and lower bounds for the speed. In particular, we construct a generalized Zeldovich–Frank–Kamenetskii type lower bound for the speed and upper bounds in terms of the speed of the standard reaction diffusion problem. We construct asymptotically exact lower bounds previously obtained by perturbation theory.
ISSN:0951-7715
1361-6544
DOI:10.1088/1361-6544/ace0ef