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Flattening functions on flowers

Published online by Cambridge University Press:  01 December 2007

EDMUND HARRISS  and
OLIVER JENKINSON
EDMUND HARRISS
Affiliation:
School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK (email: [email protected], [email protected])
OLIVER JENKINSON
Affiliation:
School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK (email: [email protected], [email protected])
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Abstract

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Let T be an orientation-preserving Lipschitz expanding map of the circle . A pre-image selector is a map with finitely many discontinuities, each of which is a jump discontinuity, and such that τ(x)∈T−1(x) for all . The closure of the image of a pre-image selector is called a flower and a flower with p connected components is called a p-flower. We say that a real-valued Lipschitz function can be Lipschitz flattened on a flower whenever it is Lipschitz cohomologous to a constant on that flower. The space of Lipschitz functions which can be flattened on a given p-flower is shown to be of codimension p in the space of all Lipschitz functions, and the linear constraints determining this subspace are derived explicitly. If a Lipschitz function f has a maximizing measure S which is Sturmian (i.e. is carried by a 1-flower), it is shown that f can be Lipschitz flattened on some 1-flower carrying S.

Type
Research Article
Information
Ergodic Theory and Dynamical Systems , Volume 27 , Issue 6 , December 2007 , pp. 1865 - 1886
Copyright
Copyright © Cambridge University Press 2007

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