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- W2070795787 abstract "The goal of this paper was to explain certain experimentally observed properties of the (cuspidal) spectrum and its associated automorphic forms (Maass waveforms) on the congruence subgroup Γ0(9). The first property is that the spectrum possesses multiplicities in the so-called new part, where it was previously believed to be simple. The second property is that the spectrum does not contain any ‘genuinely new’ eigenvalues, in the sense that all eigenvalues of Γ0(9) appear in the spectrum of some congruence subgroup of lower level. The main theorem in this paper gives a precise decomposition of the spectrum of Γ0(9) and in particular, we show that the genuinely new part is empty. We also prove that there exist an infinite number of eigenvalues of Γ0(9) where the corresponding eigenspace is of dimension at least two and has a basis of pairs of Hecke-Maass newforms which are related to each other by a character twist. These forms are non-holomorphic analogues of modular forms with inner twists and also provide explicit (affirmative) examples of a conjecture stating that if the Hecke eigenvalues of two ‘generic’ Maass newforms coincide on a set of primes of density ½ then they have to be related by a character twist." @default.
- W2070795787 created "2016-06-24" @default.
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- W2070795787 date "2012-03-08" @default.
- W2070795787 modified "2023-10-02" @default.
- W2070795787 title "Newforms and spectral multiplicity for Γ0 (9)" @default.
- W2070795787 doi "https://doi.org/10.1112/plms/pds004" @default.
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