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

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May 2004, 4(2): 391-406. doi: 10.3934/dcdsb.2004.4.391

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

1.	Department of Physics and Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, United States, United States

Received October 2002 Revised June 2003 Published February 2004

Abstract
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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.

Keywords: invariant measures, Singular maps, weierstrass function, period-adding bifurcations..

Mathematics Subject Classification: 37D5.

Citation: T. Gilbert, J. R. Dorfman. On the parametric dependences of a class of non-linear singular maps. Discrete & Continuous Dynamical Systems - B, 2004, 4 (2) : 391-406. doi: 10.3934/dcdsb.2004.4.391

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