The Paramodular Conjecture for rational abelian surfaces

Let pp be a prime. A paramodular form here is a Hecke eigenform FS2(Γpara[p])F\in S^2(\Gamma^{\text{para}}[p]) with rational eigenvalues; exclude Gritsenko lifts. Let A\mathcal{A} be an isogeny class of rational abelian surfaces of conductor pp, and let L(F,s)L(F,s) and L(A,s,L(\mathcal{A},s,Hasse--Weil)) denote their respective LL-series. Paramodular Conjecture. There is a bijection between lines of such eigenforms FF and isogeny classes of such abelian surfaces A\mathcal{A}, under which

L(A,s,Hasse–Weil)=L(F,s).L(\mathcal{A},s,\text{Hasse--Weil})=L(F,s).

The conjecture gives a correspondence between weight-two paramodular forms and abelian surfaces of prime conductor; the source also notes that analytic continuation and functional equations for the two LL-series are conjectural in this setting.

Sources & referencesView supporting material

Primary source

Nathan C. Ryan and Gonzalo Tornaría, “A Böcherer-Type Conjecture for Paramodular Forms”, arXiv:1006.1582 (2010).

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