The Halo conjecture for the GL2\operatorname{GL}_2 eigencurve

Let pp be an odd prime, let W\mathcal{W} be the weight space for GL2\operatorname{GL}_2, and let X\mathcal{X} be an eigencurve with weight map wt:XW\operatorname{wt}:\mathcal{X}\to\mathcal{W} and slope map ap:XGmriga_p:\mathcal{X}\to\mathbb{G}_m^{\operatorname{rig}}. For r(0,1)r\in(0,1), write W>r={T>r}\mathcal{W}^{>r}=\{|T|>r\} and X>r=wt1(W>r)\mathcal{X}^{>r}=\operatorname{wt}^{-1}(\mathcal{W}^{>r}). For a point zz of X\mathcal{X}, let Twt(z)T_{\operatorname{wt}(z)} be the weight-space parameter defined by Tχ=χ(exp(p))1T_\chi=\chi(\exp(p))-1. The Halo conjecture. There exists some r(0,1)r\in(0,1) sufficiently close to 11 such that: (1) X>r\mathcal{X}^{>r} is a disjoint union of countably infinitely many components X1>r,X2>r,\mathcal{X}_1^{>r},\mathcal{X}_2^{>r},\ldots, and wt:Xn>rW>r\operatorname{wt}:\mathcal{X}_n^{>r}\to\mathcal{W}^{>r} is finite flat for every nn; (2) there are rational numbers α1α2Q0\alpha_1\leq\alpha_2\leq\cdots\in\mathbb{Q}_{\geq0} tending to infinity such that, for every zXn>rz\in\mathcal{X}_n^{>r},

v(ap(z))=αnv(Twt(z));v(a_p(z))=\alpha_n\,v(T_{\operatorname{wt}(z)});

and (3) the sequence (αn)(\alpha_n), counted with multiplicities, is a disjoint union of finitely many arithmetic progressions. The conjecture predicts a rigid and eventually patterned geometry for the eigencurve near the boundary of weight space. The source later states that the full Halo conjecture is established, so this conjectural formulation is solved.

Sources & referencesView supporting material

Primary source

Hansheng Diao and Zijian Yao, “The Halo Conjecture for GL2”, arXiv:2302.07987 (2023).

Additional references

2 papers in this index state this conjecture (2016–2023). The statement above is taken from the most recent of them; the others are arXiv:1604.07739.

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