Central limit conjecture for the Sudler product along Euler's number

From papers

Let PN(e)P_N(e) be the Sudler product associated with Euler's number ee, whose continued fraction is e=[2;1,2,1,1,4,1,,1,2n,1,]e=[2;1,2,1,1,4,1,\dots,1,2n,1,\dots]. The relevant normalization suggested by the source is

π540(logNloglogN)3/2.\frac{\pi}{\sqrt{540}}\left(\frac{\log N}{\log\log N}\right)^{3/2}.

Euler Sudler-product central limit conjecture. For every tRt\in\mathbb R,

1M{1NM:logPN(e)π540(logNloglogN)3/2t}t12πex2/2dxas M.\frac{1}{M}\left|\left\{1\leq N\leq M:\frac{\log P_N(e)}{\frac{\pi}{\sqrt{540}}\left(\frac{\log N}{\log\log N}\right)^{3/2}}\leq t\right\}\right| \to\int_{-\infty}^{t}\frac{1}{\sqrt{2\pi}}e^{-x^2/2}\,\mathrm{d}x \quad\text{as }M\to\infty.

The conjecture is motivated by the Lindeberg-type condition for the continued fraction of ee and by the proved asymptotic variance of logPN(e)\log P_N(e); it predicts Gaussian fluctuations around the negligible mean.

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Sources & referencesView supporting material

Primary source

Bence Borda, “On the distribution of Sudler products and Birkhoff sums for the irrational rotation”, arXiv:2104.06716 (2023).

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