Ahead of the Fisher–KPP front - Archive ouverte HAL
Article Dans Une Revue Nonlinearity Année : 2023

Ahead of the Fisher–KPP front

Résumé

The solution h to the Fisher–KPP equation with a steep enough initial condition develops into a front moving at velocity 2, with logarithmic corrections to its position. In this paper we investigate the value h ( c t , t ) of the solution ahead of the front, at time t and position ct , with c > 2. That value goes to zero exponentially fast with time, with a well-known rate, but the prefactor depends in a non-trivial way of c , the initial condition and the nonlinearity in the equation. We compute an asymptotic expansion of that prefactor for velocities c close to 2. The expansion is surprisingly explicit and irregular. The main tool of this paper is the so-called ‘magical expression’ which relates the position of the front, the initial condition, and the quantity we investigate.
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Dates et versions

hal-04782285 , version 1 (14-11-2024)

Identifiants

Citer

Éric Brunet. Ahead of the Fisher–KPP front. Nonlinearity, 2023, 36 (10), pp.5541-5567. ⟨10.1088/1361-6544/acf268⟩. ⟨hal-04782285⟩
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