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A new-and old-form theory for Bessel periods of (cuspidal automorphic) Saito-Kurokawa representations π = ⊗vπv of PGSp 4 is given. We introduce arithmetic subgroups so that a local Bessel vector fixed by the subgroup indexed by the conductor of πv is unique up to scalars. This vector is called the local newform of πv. The global Langlands L-function of a holomorphic Saito-Kurokawa representation coincides with a canonically settled Piatetski-Shapiro zeta integral of the global newform.
Let π be an irreducible admissible (complex) representation of GL(2) over a non‐Archimedean characteristic zero local field with odd residual characteristic. In this paper, we prove the equality between the local symmetric square L‐function associated to π arising from integral representations and the corresponding Artin L‐function for its Langlands parameter through the local Langlands correspondence. With this in hand, we show the stability of local symmetric γ‐factors attached to π under highly ramified twists.
For noncuspidal irreducible admissible representations of GSp(4, k) over a local non‐Archimedean field k, we determine the exceptional poles of the spinor L‐factor attached to anisotropic Bessel models by Piatetski–Shapiro. This completes the classification of spinor L‐factors for GSp(4, k).
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