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Bifurcations of dynamic rays in complex polynomials of degree two

  • Pau Atela (a1)

In the study of bifurcations of the family of degree-two complex polynomials, attention has been given mainly to parameter values within the Mandelbrot set M (e.g., connectedness of the Julia set and period doubling). The reason for this is that outside M, the Julia set is at all times a hyperbolic Cantor set. In this paper weconsider precisely this, values of the parameter in the complement of M. We find bifurcations occurring not on the Julia set itself but on the dynamic rays landing on itfrom infinity. As the parameter crosses the external rays of M, in the dynamic plane the points of the Julia set gain and lose dynamic rays. We describe these bifurcations with the aid of a family of circle maps and we study in detail the case of the fixed points.

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[B]P. Blanchard . Complex analytic dynamics on the Riemann sphere. Bull. Amer. Math. Soc. 11 (1984), 85141.

[Bo]P. Boyland . Bifurcations of circle Maps: Arnol'd tongues, bistability and rotation intervals. Commun. Math. Phys. 106 (1986), 353381.

[Dou]A. Douady . Algorithms for computing angles in the Mandelbrot set. Chaotic Dynamics and Fractals. M. Barnsley and S. G. Demko , eds, Academic Press: New York, 1986, 155168.

[He]M. Herman . Sur la conjugaison diffélrentiable des difieomorphismes du cercle à des rotations. Publ. Math., IHES 49 (1979), 5234.

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Ergodic Theory and Dynamical Systems
  • ISSN: 0143-3857
  • EISSN: 1469-4417
  • URL: /core/journals/ergodic-theory-and-dynamical-systems
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