2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144136Methods of theta correspondence are used to analyze local and global Bessel models for $GSp(4)$ proving a conjecture of Gross and Prasad which describes these models in terms of local epsilon factors in the local case, and the non-vanishing of central critical $L$-value in the global case.Number TheoryRepresentation Theorytext