Conditional first-moment asymptotic conjecture for Rademacher coefficients

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Let (X(k))k⩾1(X(k))_{k \geqslant 1} be a sequence of independent random variables uniform on {±1}\{\pm 1\}, and define (A(N))N⩾0(A(N))_{N \geqslant 0} by the paper's formal power series. For any finite subset K⊆N\mathcal{K} \subseteq \mathbb{N} of positive integers and any function ε:K→{±1}\varepsilon:\mathcal{K}\to\{\pm 1\}, consider the conditional expectation obtained by fixing X(k)=ε(k)X(k)=\varepsilon(k) for every k∈Kk\in\mathcal{K}. Conditional Rademacher first-moment conjecture. There exists an absolute positive constant C(ε)C(\varepsilon) such that

E[∣A(N)∣:X(k)=ε(k) for all k∈K]∼C(ε)(log⁡N)1/4as N→∞.\mathbb{E}\left[|A(N)|: X(k)=\varepsilon(k) \text{ for all } k\in\mathcal{K}\right] \sim \frac{C(\varepsilon)}{(\log N)^{1/4}} \qquad \text{as } N\to\infty.

This is a stronger conditional version of the Rademacher case, motivated by the possibility of an Euler-product description of the asymptotic constant. Its status remains conjectural.

References

Primary source

Daksh Aggarwal, Unique Subedi, William Verreault, Asif Zaman and Chenghui Zheng, “A conjectural asymptotic formula for multiplicative chaos in number theory”, arXiv:2108.11367 (2021).

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