Connectedness conjecture for the crystalline deformation-ring fibre

Let F\mathbb{F} be a finite field of characteristic pp, let KK be a finite extension of Qp\mathbb{Q}_p with absolute Galois group GKG_K, and let VFV_{\mathbb{F}} be an absolutely irreducible finite-dimensional F\mathbb{F}-representation of GKG_K. Assume that F\mathbb{F} is sufficiently large and that

VF=IndGLGKWF,V_{\mathbb{F}}=\operatorname{Ind}_{G_L}^{G_K}W_{\mathbb{F}},

where L/KL/K is unramified, WFW_{\mathbb{F}} is one-dimensional, and the residue field ll of LL embeds into F\mathbb{F}. Let R=RVFR=R^\square_{V_{\mathbb{F}}}, let L=LR,crysp\mathcal{L}=\mathcal{L}^{\leq p}_{R,\operatorname{crys}}, and let LF=LRF\mathcal{L}_{\mathbb{F}}=\mathcal{L}\otimes_R\mathbb{F} be its fibre over the closed point of SpecR\operatorname{Spec}R. Let f ⁣:Lp(WF)Lp(VF)f_*\colon\mathcal{L}^{\leq p}(W_{\mathbb{F}})\to\mathcal{L}^{\leq p}(V_{\mathbb{F}}) be the map induced by induction. Connectedness conjecture. Every closed point of LF\mathcal{L}_{\mathbb{F}} lies in the same connected component as a closed point arising from fNf_*\mathfrak{N} for some NLp(WF)\mathfrak{N}\in\mathcal{L}^{\leq p}(W_{\mathbb{F}}). This conjectural connectedness statement would strengthen the paper's potential diagonalizability result by controlling the connected components of the crystalline deformation-ring fibre; its resolution is not specified in the source.

Sources & referencesView supporting material

Primary source

Robin Bartlett, “On the irreducible components of some crystalline deformation rings”, arXiv:1904.12548 (2020).

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