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On the lifting of hermitian modular forms

Published online by Cambridge University Press:  01 September 2008

Tamotsu Ikeda*
Affiliation:
Graduate school of Mathematics, Kyoto University, Kitashirakawa, Kyoto, 606-8502, Japan (email: ikeda@math.kyoto-u.ac.jp)
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Abstract

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Let K be an imaginary quadratic field with discriminant −D. We denote by 𝒪 the ring of integers of K. Let χ be the primitive Dirichlet character corresponding to K/ℚ. Let be the hermitian modular group of degree m. We construct a lifting from S2k(SL2(ℤ)) to S2k+2nK(2n+1),det kn) and a lifting from S2k+10(D),χ) to S2k+2nK(2n),det kn). We give an explicit Fourier coefficient formula of the lifting. This is a generalization of the Maass lift considered by Kojima, Krieg and Sugano. We also discuss its extension to the adele group of U(m,m).

Type
Research Article
Copyright
Copyright © Foundation Compositio Mathematica 2008