On the automorphic sheaves for GSp4
Abstract
In this paper we first review the setting for the geometric Langlands functoriality and establish a result for the `backward' functoriality functor. We illustrate this by known examples of the geometric theta-lifting. We then apply the above result to obtain new Hecke eigen-sheaves. The most important application is a construction of the automorphic sheaf for G=GSp4 attached to a GL-local system on a curve X such that its standard representation is an irreducible local system of rank 4 on X.
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