CONCENTRATION PHENOMENA IN FITZHUGH-NAGUMO'S EQUATIONS: A MESOSCOPIC APPROACH

Alain Blaustein (1) , Francis Filbet (1)

1 IMT - Institut de Mathématiques de Toulouse UMR5219

We consider a spatially extended mesoscopic FitzHugh-Nagumo model with strong local interactions and prove that its asymptotic limit converges towards the classical nonlocal reaction-diffusion FitzHugh-Nagumo system. As the local interactions strongly dominate, the weak solution to the mesoscopic equation under consideration converges to the local equilibrium, which has the form of Dirac distribution concentrated to an averaged membrane potential. Our approach is based on techniques widely developed in kinetic theory (Wasserstein distance, relative entropy method), where macroscopic quantities of the mesoscopic model are compared with the solution to the nonlocal reaction-diffusion system. This approach allows to make the rigorous link between microscopic and reaction-diffusion models.

Mots clés: FitzHugh-Nagumo system; Wasserstein distance; blow-up profile; blow-up profile 2010MSC: 35K57; 35Q92; 35D30

Domaines: Equations aux dérivées partielles [math.AP]

Alain Blaustein, Francis Filbet. CONCENTRATION PHENOMENA IN FITZHUGH-NAGUMO'S EQUATIONS: A MESOSCOPIC APPROACH. 2022. ⟨hal-03515748v1⟩