Coleman–Mazur–Buzzard–Kilford halo conjecture for eigencurves

Let pp be an odd prime, let W\mathscr{W} be the rigid analytic space parametrizing continuous characters of Zp×\mathbb{Z}_p^\times, and write T(w)=w(exp(p))1T(w)=w(\exp(p))-1 for the TT-coordinate of a weight wWw\in\mathscr{W}. For r(0,1)r\in(0,1), let W>r\mathscr{W}_{>r} be the rigid analytic subset where T>r|T|>r. Fix a tame level, let Z\mathscr{Z} be the corresponding eigencurve, let w:ZWw:\mathscr{Z}\to\mathscr{W} be the weight map, let ap:ZGma_p:\mathscr{Z}\to\mathbb{G}_m be the map given by the UpU_p-eigenvalue, and let Z>r\mathscr{Z}_{>r} be the preimage of W>r\mathscr{W}_{>r}. Coleman–Mazur–Buzzard–Kilford halo conjecture. When r(0,1)r\in(0,1) is sufficiently close to 11^-, the space Z>r\mathscr{Z}_{>r} is a disjoint union of countably infinitely many connected components Z1,Z2,Z_1,Z_2,\dotsc such that the weight map w:ZnW>rw:Z_n\to\mathscr{W}_{>r} is finite and flat for each nn, and there exist nonnegative rational numbers α1,α2,Q\alpha_1,\alpha_2,\dotsc\in\mathbb{Q}, in non-decreasing order and tending to infinity, such that for every nn and every point zZnz\in Z_n,

ap(z)=T(w(z))αn.|a_p(z)|=|T(w(z))|^{\alpha_n}.

This conjecture describes the geometry of the eigencurve over the boundary of weight space and is commonly called the halo conjecture. It was stated here as the Coleman–Mazur–Buzzard–Kilford conjecture, following Liu–Wan–Xiao; the supplied material does not establish whether it has been resolved.

Sources & referencesView supporting material

Primary source

Lynnelle Ye, “Slopes in eigenvarieties for definite unitary groups”, arXiv:2004.12490 (2020).

Additional references

2 papers in this index state this conjecture (2014–2020). The statement above is taken from the most recent of them; the others are arXiv:1412.2584.

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