A1 Refereed original research article in a scientific journal
On the real zeroes of half-integral weight Hecke cusp forms
Authors: Jääsaari, Jesse
Publisher: Springer Nature
Publication year: 2026
Journal: Mathematische Annalen
Article number: 54
Volume: 394
Issue: 3
ISSN: 0025-5831
eISSN: 1432-1807
DOI: https://doi.org/10.1007/s00208-026-03393-w
Publication's open availability at the time of reporting: Open 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 address: https://research.utu.fi/converis/portal/detail/Publication/515754479
Self-archived copy's licence: CC BY
Self-archived copy's version: Publisher`s PDF
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).