On the parametric dependences of a class of non-linear singular maps

Details On the parametric dependences of a class of non-linear singular maps On the parametric dependences of a class of non-linear singular maps

2003-03-27

arxiv.org/abs/nlin/0303062v1

Nonlinear Sciences

Chaotic Dynamics

17 pages, 13 figures, to appear in Discrete and Continuous Dynamical Systems, series B Higher resolution versions of Figures 5

Scientific paper

We discuss a two-parameter family of maps that generalize piecewise linear, expanding maps of the circle. One parameter measures the effect of a non-linearity which bends the branches of the linear map. The second parameter rotates points by a fixed angle. For small values of the nonlinearity parameter, we compute the invariant measure and show that it has a singular density to first order in the nonlinearity parameter. Its Fourier modes have forms similar to the Weierstrass function. We discuss the consequences of this singularity on the Lyapunov exponents and on the transport properties of the corresponding multibaker map. For larger non-linearities, the map becomes non-hyperbolic and exhibits a series of period-adding bifurcations.

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