Stability of the local gamma factor in the unitary case

Details Stability of the local gamma factor in the unitary case Stability of the local gamma factor in the unitary case

2006-08-03

arxiv.org/abs/math/0608101v1

Mathematics

Number Theory

31 pages

Scientific paper

Rallis and Soudry have proven the stability under twists by highly ramified characters of the local gamma factor arising from the doubling method, in the case of a symplectic group or orthogonal group G over a local non-archimedean field F of characteristic zero, and a representation of G, which is not necessarily generic. This paper extends their arguments to show the stability in the case when G is a unitary group over a quadratic extension E of F, thereby completing the proof of the stability for classical groups. This stability property is important in Cogdell, Piatetski-Shapiro, and Shahidi's use of the converse theorem to prove the existence of a weak lift from automorphic, cuspidal, generic representations of G(A) to automorphic representations of GL(n,A) for appropriate n, to which references are given in the paper of Rallis and Soudry.

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