Spectral halo conjecture for Hilbert modular eigenvarieties

Let II index the relevant embeddings, let \rXD>r\rX_D^{>r} be the boundary region of the eigenvariety, let \rW>r\rW^{>r} be the corresponding weight-space region, let ww be the weight map, and let ai(x)a_i(x) and Ti,w(x)T_{i,w(x)} denote the quantities associated to the ii-th component as in the construction. When r(0,1)r\in (0,1) is sufficiently close to 11^-, there should exist, for every iIi\in I, a sequence of rational numbers

Σi=αi,0αi,1.\Sigma_i=\\{\alpha_{i,0}\leq \alpha_{i,1}\leq \dots \\}.

Writing Σ:=iIΣi\Sigma:=\prod\limits_{i\in I}\Sigma_i, the eigenvariety XD>r\mathcal{X}_D^{>r} should be a disjoint union

XD>r=α=(αi)iIΣXα\mathcal{X}_D^{>r}=\bigsqcup_{\alpha=(\alpha_i)_{i\in I}\in \Sigma}\mathcal{X}_\alpha

of possibly empty rigid analytic spaces finite over W>r\mathcal{W}^{>r} via ww, such that for every αΣ\alpha\in\Sigma and each closed point xXα(Cp)x\in\mathcal{X}_\alpha(\mathbb{C}_p),

vp(ai(x))=(p1)vp(Ti,w(x))αiv_p(a_i(x))=(p-1)v_p(T_{i,w(x)})\cdot \alpha_i

for all iIi\in I. Moreover, each sequence Σi\Sigma_i should be a disjoint union of finitely many arithmetic progressions, counted with multiplicities. This conjecture predicts a precise spectral-halo decomposition and valuation pattern near the boundary of the Hilbert modular eigenvariety, extending the Coleman–Mazur–Buzzard–Kilford picture; the supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Rufei Ren and Bin Zhao, “Spectral halo for Hilbert modular forms”, arXiv:2005.14267 (2021).

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