The salvaged residual-representation ghost conjecture

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Let p≥5p\geq 5, and let ρ‾\overline{\rho} be a residual Galois representation that is regular in the sense specified in the paper. For each κ∈Wb(ρ‾)\kappa\in\mathcal W_{b(\overline{\rho})}, write wκ=κ(1+2p)−1w_\kappa=\kappa(1+2p)-1, and let Gρ‾(w,t)G_{\overline{\rho}}(w,t) be the ghost series associated with ρ‾\overline{\rho}. Let Sκ†(ρ‾)S_\kappa^\dagger(\overline{\rho}) denote the ρ‾\overline{\rho}-isotypic component of the overconvergent pp-adic cuspforms of weight κ\kappa. The salvaged residual-representation ghost conjecture. For every κ∈Wb(ρ‾)\kappa\in\mathcal W_{b(\overline{\rho})}, the Newton polygon of Gρ‾(wκ,t)G_{\overline{\rho}}(w_\kappa,t) equals the Newton polygon of the characteristic series of the UpU_p-operator acting on Sκ†(ρ‾)S_\kappa^\dagger(\overline{\rho}). This is the paper's proposed correction to the original ghost conjecture; the regularity condition is included because the original prediction fails in the oversight cases, while the conjecture is supported by theoretical and computational evidence.

References

Primary source

John Bergdall and Robert Pollack, “Slopes of modular forms and reducible Galois representations: an oversight in the ghost conjecture”, arXiv:2110.07973 (2022).

Additional references

2 papers in this index state this conjecture (2017–2021). The statement above is taken from the most recent of them; the others are arXiv:1710.01572.

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