Cassels's conjecture on Maass forms with eigenvalue one quarter

Let ϕ\phi be a Maass form with Laplace eigenvalue 14\frac14. Cassels's conjecture. Must ϕ\phi arise from a Galois representation? The source presents this as an open conjectural question, with no resolution supplied.

Sources & referencesView supporting material

Primary source

Stephen S. Gelbart and Stephen D. Miller, “Riemann's Zeta Function and Beyond”, arXiv:math/0309478 (2003).

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