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Particle systems with a singular mean-field self-excitation. Application to neuronal networks. (English) Zbl 1328.60134

Summary: We discuss the construction and approximation of solutions to a nonlinear McKean-Vlasov equation driven by a singular self-excitatory interaction of the mean-field type. Such an equation is intended to describe an infinite population of neurons which interact with one another. Each time a proportion of neurons “spike”, the whole network instantaneously receives an excitatory kick. The instantaneous nature of the excitation makes the system singular and prevents the application of standard results from the literature. Making use of the Skorokhod M1 topology, we prove that, for the right notion of a “physical” solution, the nonlinear equation can be approximated either by a finite particle system or by a delayed equation. As a by-product, we obtain the existence of ‘synchronized’ solutions, for which a macroscopic proportion of neurons may spike at the same time.

MSC:

60H10 Stochastic ordinary differential equations (aspects of stochastic analysis)
60K35 Interacting random processes; statistical mechanics type models; percolation theory
60J60 Diffusion processes
82C32 Neural nets applied to problems in time-dependent statistical mechanics
92C20 Neural biology
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