Pullbacks of Eisenstein series from GU(3,3) and critical L-values for GSp(4) X GL(2)

Details Pullbacks of Eisenstein series from GU(3,3) and critical L-values for GSp(4) X GL(2) Pullbacks of Eisenstein series from GU(3,3) and critical L-values for GSp(4) X GL(2)

2009-04-25

arxiv.org/abs/0904.4005v2

Mathematics

Number Theory

45 pages; Some notational changes made, inaccuracies eliminated and typos fixed in accordance with an anonymous referee's help

Scientific paper

Let F be a genus two Siegel newform and g a classical newform, both of squarefree levels and of equal weight l. We prove a pullback formula for certain Eisenstein series -- thus generalizing a construction of Shimura -- and use this to derive an explicit integral representation for the degree eight L-function L(s, F X g). This integral representation involves the pullback of a simple Siegel-type Eisenstein series on the unitary group GU(3,3). As an application, we prove a reciprocity law -- predicted by Deligne's conjecture -- for the critical special values L(m, F X g) where m is an integer, 2 <= m <= l/2-1.

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