Arxiv:Math/9911264V1 [Math.NT] 1 Nov 1999
Annals of Mathematics, 150 (1999), 807–866 On explicit lifts of cusp forms from GLm to classical groups By David Ginzburg, Stephen Rallis, and David Soudry* Introduction In this paper, we begin the study of poles of partial L-functions LS(σ ⊗ τ,s), where σ ⊗ τ is an irreducible, automorphic, cuspidal, generic (i.e. with nontrivial Whittaker coefficient) representation of GA × GLm(A). G is a split classical group and A is the adele ring of a number field F . We also consider Sp2n(A) × GLm(A), where ∼ denotes the metaplectic cover. Examining LS(σ ⊗ τ,s) through the corresponding Rankin-Selberg, or Shimura-typef integrals ([G-PS-R], [G-R-S3], [G], [So]), we find that the global integral contains, in its integrand, a certain normalized Eisenstein series which is responsible for the poles. For example, if G = SO2k+1, then the Eisenstein series is on the adele points of split SO2m, induced from the Siegel parabolic s−1/2 subgroup and τ ⊗ | det ·| . If G = Sp2k (this is a convenient abuse of notation), then the Eisenstein series is on Sp2m(A), induced from the Siegel parabolic subgroup and τ ⊗ | det ·|s−1/2. Thef constant term (along the “Siegel radical”) of such a normalized Eisenstein series involves one of the L-functions LS(τ, Λ2, 2s − 1) or LS(τ, Sym2, 2s − 1). So, up to problems of normalization of intertwining operators, the only pole we expect, for Re(s) > 1/2, is at s = 1 and then τ should be self-dual. (See [J-S1], [B-G].) Thus, let us assume that τ is self-dual.
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