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Arithmetic properties of similitude theta lifts from orthogonal to symplectic groups

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Abstract

Adapting the work of Kudla and Millson we obtain a lifting of cuspidal cohomology classes for the symmetric space associated to GO(V) for an indefinite rational quadratic space V of even dimension to holomorphic Siegel modular forms on GSp n (A). For n =  2 we prove the Thom Lemma for hyperbolic 3-space, which together with results of Kudla and Millson imply an interpretation of the Fourier coefficients of the theta lift as period integrals of the cohomology class over certain cycles, and relates those over infinite geodesics to L-values of cusp forms for GL2 over imaginary quadratic fields. This allows us to prove, for almost all primes p, the p-integrality of the lift for a particular choice of Schwartz function. We further calculate the Hecke eigenvalues (including for some “bad” places) for this choice in the case of V of signature (3,1).

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  1. School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Sheffield, S3 7RH, UK

    Tobias Berger

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  1. Tobias Berger
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Berger, T. Arithmetic properties of similitude theta lifts from orthogonal to symplectic groups. manuscripta math. 143, 389–417 (2014). https://doi.org/10.1007/s00229-013-0628-8

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  • DOI: https://doi.org/10.1007/s00229-013-0628-8

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