On the cuspidality of pullbacks of Siegel Eisenstein series and applications to the Bloch-Kato conjecture

Details On the cuspidality of pullbacks of Siegel Eisenstein series and applications to the Bloch-Kato conjecture On the cuspidality of pullbacks of Siegel Eisenstein series and applications to the Bloch-Kato conjecture

2007-12-13

arxiv.org/abs/0712.2227v1

Mathematics

Number Theory

33 pages

Scientific paper

Let $k > 3$ be an integer and $p$ a prime with $p > 2k-2$. Let $f$ be a newform of weight $2k-2$ and level 1 so that $f$ is ordinary at $p$ and $\bar{\rho}_{f}$ is irreducible. Under some additional hypotheses we prove that $ord_{p}(L_{alg}(k,f)) \leq ord_{p}(# S)$ where $S$ is the Pontryagin dual of the Selmer group associated to $\rho_{f} \otimes \epsilon^{1-k}$ with $\epsilon$ the $p$-adic cyclotomic character. We accomplish this by first constructing a congruence between the Saito-Kurokawa lift of $f$ and a non-CAP Siegel cusp form. Once this congruence is established, we use Galois representations to obtain the lower bound on the Selmer group.

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