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arXiv 1307.0359math.DS
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非一致扩张映射中相关衰减的下界

Lower Bounds for the Decay of Correlations in Non-uniformly Expanding Maps

Huyi Hu, Sandro Vaienti

摘要:

我们给出了非一致扩张映射的相关衰减和一大类可观测量的多项式型下界的条件。证明了在巴拿赫空间B中,若第一返回映射的转移算子满足Lasota-Yorke型不等式,且所得到的绝对连续不变测度是弱混合的,则在一定的更新条件下,B中观测量的相关性具有多项式衰减性.我们还提供了一些一般的条件,使扩张映射在高维空间中的非周期性。作为应用,我们得到了具有中立不动点的分段扩张映射的下界,并且对于该映射我们还允许非马尔可夫结构和无界失真。观测量是具有有界变差或满足拟赫尔德条件的函数,并且它们的支撑远离中性不动点有界。

英文摘要:

We give conditions under which nonuniformly expanding maps exhibit lower bounds of polynomial type for the decay of correlations and for a large class of observables. We show that if the Lasota-Yorke type inequality for the transfer operator of a first return map are satisfied in a Banach space B, and the absolutely continuous invariant measure obtained is weak mixing, in terms of aperiodicity, then under some renewal condition, the maps have polynomial decay of correlations for observables in B. We also provide some general conditions that give aperiodicity for expanding maps in higher dimensional spaces. As applications, we obtain lower bounds for piecewise expanding maps with an indifferent fixed point and for which we also allow non-Markov structure and unbounded distortion. The observables are functions that have bounded variation or satisfy quasi-Hölder conditions and have their support bounded away from the neutral fixed points.

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