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Nonlinear integrate and fire neuron models: analysis and numerics

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Partial Differential Equations in Kinetic Theories

Abstract: Nonlinear Noisy Leaky Integrate and Fire (NNLIF) models for neurons networks can be written as Fokker-Planck-Kolmogorov equations on the probability density of neurons, the main parameters in the model being the connectivity of the network and the noise. We analyse several aspects of the NNLIF model: the number of steady states, a priori estimates, blow-up issues and convergence toward equilibrium in the linear case. In particular, for excitatory networks, blow-up always occurs for initial data concentrated close to the firing potential. These results show how critical is the balance between noise and excitatory/inhibitory interactions to the connectivity parameter. This is a work in collaboration with M. J. Cceres and B. Perthame.

This talk is part of the Isaac Newton Institute Seminar Series series.

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