Conditional first-moment asymptotic conjecture for Rademacher coefficients

From papers

Let (X(k))k1(X(k))_{k \geqslant 1} be a sequence of independent random variables uniform on {±1}\{\pm 1\}, and define (A(N))N0(A(N))_{N \geqslant 0} by the paper's formal power series. For any finite subset KN\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 kKk\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 kK]C(ε)(logN)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.

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Sources & referencesView supporting material

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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