Pearce-Crump's family-averaged Dirichlet ratio moment conjecture

Let q≢2(mod4)q\not\equiv2\pmod4, and let φ∗(q)\varphi^*(q) denote the number of primitive characters modulo qq. For each primitive character χ\chi modulo qq, write the non-trivial zeros of L(s,χ)L(s,\chi) as ρ=12+iγχ\rho=\tfrac12+i\gamma_\chi. Assume the Generalised Riemann Hypothesis for every L(s,χ)L(s,\chi) and that all its zeros are simple. Family-averaged Dirichlet ratio moment conjecture. As T→∞T\to\infty,

1φ∗(q)∑χ mod q∗  ∑0<γχ≤T∣L(2ρ,χ2)L′(ρ,χ)∣2∼φ(q)q T2π,\frac{1}{\varphi^*(q)}\sum_{\chi\bmod q}^{*}\;\sum_{0<\gamma_\chi\le T}\left|\frac{L(2\rho,\chi^2)}{L'(\rho,\chi)}\right|^2\sim\frac{\varphi(q)}{q}\,\frac{T}{2\pi},

and this asymptotic is expected to hold uniformly for q≤TAq\le T^A, for any fixed A>0A>0. The conjecture follows formally by averaging the characterwise prediction, but its asserted uniform asymptotic remains open.

References

Primary source

Andrew Pearce-Crump, “Negative discrete second moments of Dirichlet L-functions”, arXiv:2606.25094 (2026).

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