Analysis and approximation of stochastic nerve axon equations

Sauer, Martin; Stannat, Wilhelm

doi:10.1090/mcom/3068

Analysis and approximation of stochastic nerve axon equations
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by Martin Sauer and Wilhelm Stannat;

Math. Comp. 85 (2016), 2457-2481

DOI: https://doi.org/10.1090/mcom/3068

Published electronically: January 8, 2016

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Abstract:

We consider spatially extended conductance based neuronal models with noise described by a stochastic reaction diffusion equation with additive noise coupled to a control variable with multiplicative noise but no diffusion. We only assume a local Lipschitz condition on the non-linearities together with a certain physiologically reasonable monotonicity to derive crucial $L^\infty$-bounds for the solution. These play an essential role in both the proof of existence and uniqueness of solutions as well as the error analysis of the finite difference approximation in space. We derive explicit error estimates, in particular, a pathwise convergence rate of $\sqrt {1/n}-$ and a strong convergence rate of $1/n$ in special cases. As applications, the Hodgkin-Huxley and FitzHugh-Nagumo systems with noise are considered.

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