This paper demonstrates the central limit theorem and mixing local central limit theorem for observables, suggesting implications for Boolean-type transformations and the Lindelöf hypothesis.
We prove the central limit theorem (CLT), the first-order Edgeworth expansion and a mixing local central limit theorem (MLCLT) for Birkhoff sums of a class of unbounded heavily oscillating observables over a family of full-branch piecewise C² expanding maps of the interval. As a corollary, we obtain the corresponding results for Boolean-type transformations on R . The class of observables in the CLT and the MLCLT on R include the real part, the imaginary part and the absolute value of the Riemann zeta function. Thus obtained CLT and MLCLT for the Riemann zeta function are in the spirit of the results of Lifschitz & Weber [Sampling the Lindelöf hypothesis with the Cauchy random walk. Proc. Lond. Math. Soc. (3) 98 (2009), 241–270] and Steuding [Sampling the Lindelöf hypothesis with an ergodic transformation. RIMS Kôkyûroku Bessatsu B34 (2012), 361–381] who have proven the strong law of large numbers for sampling the Lindelöf hypothesis .
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Fernando et al. (2025) studied this question.
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