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arXiv 0705.1610math.DSmath.AT
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紧致流形上连续自映射的拓扑熵的自下估计

Estimates of the topological entropy from below for continuous self-maps on some compact manifolds

W. Marzantowicz, F. Przytycki

摘要:

扩展我们的结果在"熵猜想连续映射的nilmanifold",出现在以色列杂志。数学,我们证明了熵猜想对紧致$K(π,1)$流形的每个连续自映射成立,该流形具有基本群$π$无挠的且几乎幂零,特别是对亚幂零流形的每个连续自映射成立。事实上,我们证明了一个更强的版本,一个较低的估计拓扑熵的映射的对数的谱半径的相关的"线性化矩阵"与整数条目。由此,参考已知的多项式的Mahler测度的估计,我们推出了熵的一些绝对下界。

英文摘要:

Extending our results in "Entropy conjecture for continuous maps of nilmanifolds", to appear in Israel Jour. of Math., we confirm that Entropy Conjecture holds for every continuous self-map of a compact $K(π,1)$ manifold with the fundamental group $π$ torsion free and virtually nilpotent, in particular for every continuous map of an infra-nilmanifold. In fact we prove a stronger version, a lower estimate of the topological entropy of a map by logarithm of the spectral radius of an associated "linearization matrix" with integer entries. From this, referring to known estimates of Mahler measure of polynomials, we deduce some absolute lower bounds for the entropy.

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