Thermodynamic formalism and multifractal analysis of Birkhoff averages for non-uniformly expanding R\'enyi interval maps with countably many branches
Abstract
In this paper, we study the multifractal spectrum of Birkhoff averages for non-uniformly expanding R\'enyi interval maps with countably many branches. Our main theorem substantially strengthens conditional variational formulas established by Jaerisch and Takahasi. Furthermore, our results enable a detailed analysis of Khinchin exponents and arithmetic means of backward continued fraction expansions in terms of the Hausdorff dimension. We also give a positive answer to the conjecture of Jaerisch and Takahasi. In addition, we develop the thermodynamic formalism for non-uniformly expanding R\'enyi interval maps with countably many branches.
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