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Andrew Pearce-Crump

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Preprint Sep 2026

Central non-vanishing of Dirichlet $L$-functions

We prove that, for every sufficiently large modulus $q\not\equiv2\bmod4$, at least $3/8-o(1)$ of the primitive Dirichlet characters $\chi$ modulo $q$ have $L(1/2,\chi)\ne0$. We also establish stronger proportions for moduli $q$ satisfying certain arithmetic conditions.

Benjamin Durkan, Andrew Pearce-Crump · 1 citation
Preprint Sep 2026

The sixth moment of a degree two $L$-function of arbitrary level

Let $f$ be a primitive holomorphic cusp form of arbitrary weight, level and nebentypus. We prove $\int_0^T|L(1/2+it,f)|^6\,dt\ll_{f,\epsilon}T^{2+\epsilon}$, extending Jutila's level-one theorem. The new ingredient is a large sieve comparing the stationary phases in the Booker-Milinovich-Ng transformation at different...

Andrew Pearce-Crump · 0 citations
Preprint Jul 2026

A sharp almost sure upper bound for partial sums of random multiplicative functions

We prove that, for either a Steinhaus random multiplicative function or a Rademacher random multiplicative function $f$, and every $\varepsilon>0$, almost surely $|\sum_{n\le x}f(n)|\ll_{\varepsilon,f}\sqrt{x}(\log\log x)^{1/4+\varepsilon}$. Together with Harper's almost sure lower bound, this determines the sharp loga...

Benjamin Durkan, Andrew Pearce-Crump · 2 citations · ⚡1

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