Adelic Maass spaces on U(2,2)

Details Adelic Maass spaces on U(2,2) Adelic Maass spaces on U(2,2)

2007-06-19

arxiv.org/abs/0706.2828v1

Mathematics

Number Theory

15 pages

Scientific paper

Generalizing the results of Kojima, Gritsenko and Krieg, we define an adelic version of the Maass space for hermitian modular forms of weight k regarded as functions on adelic points of the quasi-split unitary group U(2,2) associated with an imaginary quadratic extension F/Q of discriminant D_F. When the class number h_F of F is odd, we show that the Maass space is invariant under the action of the local Hecke algebras of U(2,2)(Q_p) for all p not dividing D_F. As a consequence we obtain a Hecke-equivariant injective map from the Maass space to the h_F-fold direct product of the space of elliptic modular forms of weight k-1 and level D_F.

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