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Construction and non-vanishing of a family of vector-valued Siegel Poincaré series (2405.02966v1)

Published 5 May 2024 in math.NT and math.RT

Abstract: Using Poincar\'e series of $ K $-finite matrix coefficients of integrable antiholomorphic discrete series representations of $ \mathrm{Sp}{2n}(\mathbb R) $, we construct a spanning set for the space $ S\rho(\Gamma) $ of Siegel cusp forms of weight $ \rho $ for $ \Gamma $, where $ \rho $ is an irreducible polynomial representation of $ \mathrm{GL}n(\mathbb C) $ of highest weight $ \omega\in\mathbb Zn $ with $ \omega_1\geq\ldots\geq\omega_n>2n $, and $ \Gamma $ is a discrete subgroup of $ \mathrm{Sp}{2n}(\mathbb R) $ commensurable with $ \mathrm{Sp}_{2n}(\mathbb Z) $. Moreover, using a variant of Mui\'c's integral non-vanishing criterion for Poincar\'e series on unimodular locally compact Hausdorff groups, we prove a result on the non-vanishing of constructed Siegel Poincar\'e series.

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