A1 Refereed original research article in a scientific journal

On the real zeroes of half-integral weight Hecke cusp forms




AuthorsJääsaari, Jesse

PublisherSpringer Nature

Publication year2026

Journal: Mathematische Annalen

Article number54

Volume394

Issue3

ISSN0025-5831

eISSN1432-1807

DOIhttps://doi.org/10.1007/s00208-026-03393-w

Publication's open availability at the time of reportingOpen Access

Publication channel's open availability Partially Open Access publication channel

Web address https://doi.org/10.1007/s00208-026-03393-w

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/515754479

Self-archived copy's licenceCC BY

Self-archived copy's versionPublisher`s PDF


Abstract

We examine the distribution of zeroes of half-integral weight Hecke cusp forms on the manifold Γ0(4)\H near a cusp at infinity. In analogue of the Ghosh–Sarnak conjecture for classical holomorphic Hecke cusp forms, one expects that almost all of the zeroes sufficiently close to this cusp lie on two vertical geodesics Re(s) = −1/2 and Re(s) = 0 as the weight tends to infinity. We show that, for >>ε K2/(log K)3/2+ε of the halfintegral weight Hecke cusp forms in the Kohnen plus subspaces with weight bounded by a large parameter K, the number of such “real” zeroes grows almost at the expected rate. We also obtain a weaker lower bound for the number of real zeroes that holds for a positive proportion of forms. One of the key ingredients is the estimation of averaged first and second moments of quadratic twists of modular L-functions.


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Funding information in the publication
Open Access funding provided by University of Turku (including Turku University Central Hospital).


Last updated on 11/03/2026 10:14:53 AM