Vol. 11, No. 7, 2018

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Complex rotation numbers: bubbles and their intersections

Nataliya Goncharuk

Vol. 11 (2018), No. 7, 1787–1801

The construction of complex rotation numbers, due to V. Arnold, gives rise to a fractal-like set “bubbles” related to a circle diffeomorphism. “Bubbles” is a complex analogue to Arnold tongues.

This article contains a survey of the known properties of bubbles, as well as a variety of open questions. In particular, we show that bubbles can intersect and self-intersect, and provide approximate pictures of bubbles for perturbations of Möbius circle diffeomorphisms.

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complex tori, rotation numbers, diffeomorphisms of the circle
Mathematical Subject Classification 2010
Primary: 37E10, 37E45
Received: 3 August 2017
Revised: 8 December 2017
Accepted: 9 April 2018
Published: 20 May 2018
Nataliya Goncharuk
Department of Mathematics
Cornell University
Ithaca, NY
United States