Complex dynamics in a nerve fiber model with periodic coefficients

Details Complex dynamics in a nerve fiber model with periodic coefficients Complex dynamics in a nerve fiber model with periodic coefficients

2007-08-17

arxiv.org/abs/0708.2342v1

Mathematics

Dynamical Systems

29 pages, 5 figures

Scientific paper

We deal with the periodic boundary value problem for a second-order nonlinear ODE which includes the case of the Nagumo type equation $v_{xx} - g v + n(x) F(v) = 0,$ previously considered by Grindrod and Sleeman and by Chen and Bell in the study of nerve fiber models. In some recent works we discussed the case of nonexistence of nontrivial solutions as well as the case in which many positive periodic solutions may arise, the different situations depending by threshold parameters related to the weight function $n(x).$ Here we show that for a step function $n(x)$ (or for small perturbations of it) it is possible to obtain infinitely many periodic solutions and chaotic dynamics, due to the presence of a topological horseshoe (according to Kennedy and Yorke).

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