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arXiv 0902.4619math.NT
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从正交群到辛群的相似θ提升的算术性质

Arithmetic properties of similitude theta lifts from orthogonal to symplectic groups

Tobias Berger

摘要:

通过改进Kudla和Millson的工作,我们得到了GSp_n(A)上与GO(V)相关联的对称空间的尖点上同调类对于偶数维的不定有理二次空间V到全纯Siegel模形式的提升.当n=2时,我们证明了Thom引理,它与Kudla和Millson的结果一起意味着将θ提升的傅里叶系数解释为某些循环上的上同调类的周期积分.这使我们能够证明提升的p-积分为一个特定的选择施瓦茨函数几乎所有的素数p.我们进一步计算Hecke特征值(包括一些“坏”的地方)为这个选择的情况下,V的签名(3,1)。

英文摘要:

By 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 Thom's 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. This allows us to prove the p-integrality of the lift for a particular choice of Schwartz function for almost all primes p. 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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