Mathematics – Dynamical Systems
Scientific paper
2009-12-11
Nonlinearity 23 (2010) 2429-2456
Mathematics
Dynamical Systems
33 pages, 14 figures
Scientific paper
We consider the one-parameter family of interval maps arising from generalized continued fraction expansions known as alpha-continued fractions. For such maps, we perform a numerical study of the behaviour of metric entropy as a function of the parameter. The behaviour of entropy is known to be quite regular for parameters for which a matching condition on the orbits of the endpoints holds. We give a detailed description of the set M where this condition is met: it consists of a countable union of open intervals, corresponding to different combinatorial data, which appear to be arranged in a hierarchical structure. Our experimental data suggest that the complement of M is a proper subset of the set of bounded-type numbers, hence it has measure zero. Furthermore, we give evidence that the entropy on matching intervals is smooth; on the other hand, we can construct points outside of M on which it is not even locally monotone.
Carminati Carlo
Marmi Stefano
Profeti Alessandro
Tiozzo Giulio
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