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Thermodynamic formalism and multifractal analysis of Birkhoff averages for parabolic rational maps

Abstract

In this paper, we study the multifractal analysis of Birkhoff averages for parabolic rational maps. We establish a conditional variational principle and prove the real analyticity and strict monotonicity of the Birkhoff spectrum, as well as the existence and uniqueness of the measure attaining the supremum in the conditional variational principle, on a certain region. To this end, we prove the existence and uniqueness of an expanding equilibrium measure and the real analyticity of the pressure function on a suitable domain. For parabolic systems, our approach using thermodynamic formalism provides a unified framework for establishing the conditional variational principle and investigating finer properties of the Birkhoff spectrum, including its real analyticity, strict monotonicity, and the existence and uniqueness of a measure attaining the supremum on a certain region.

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BibTeX
@misc{arima2026thermodynamic,
  title = {{Thermodynamic formalism and multifractal analysis of Birkhoff averages for parabolic rational maps}},
  author = {Yuya Arima},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.20036},
  eprint = {2609.20036},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.20036},
}
RIS
TY  - UNPB
TI  - Thermodynamic formalism and multifractal analysis of Birkhoff averages for parabolic rational maps
AU  - Yuya Arima
PY  - 2026
DA  - 2026/09/29
PB  - arXiv
DO  - 10.48550/arxiv.2609.20036
UR  - https://arxiv.org/abs/2609.20036
AB  - In this paper, we study the multifractal analysis of Birkhoff averages for parabolic rational maps. We establish a conditional variational principle and prove the real analyticity and strict monotonicity of the Birkhoff spectrum, as well as the existence and uniqueness of the measure attaining the supremum in the conditional variational principle, on a certain region. To this end, we prove the existence and uniqueness of an expanding equilibrium measure and the real analyticity of the pressure function on a suitable domain. For parabolic systems, our approach using thermodynamic formalism provides a unified framework for establishing the conditional variational principle and investigating finer properties of the Birkhoff spectrum, including its real analyticity, strict monotonicity, and the existence and uniqueness of a measure attaining the supremum on a certain region.
ER  -