The non-abelian Leopoldt conjecture for eigenvariety components
The non-abelian Leopoldt conjecture for eigenvariety components
Let be a reductive group, let be a tame level, let be an Iwahori subgroup, and set . Let and be the corresponding eigenvarieties over the weight space , and let denote the defect of . For a non-critical classical tempered cuspidal eigenpacket , write for the associated point. The non-abelian Leopoldt conjecture. Any irreducible component , or , through has dimension
This predicts that the defect measures the codimension of cuspidal eigenvariety components in the weight space, extending the usual Leopoldt philosophy to non-abelian eigenvarieties. The conjecture is attributed to Hida and Urban; the supplied text gives no evidence of a general resolution.
Sources & referencesView supporting material
Primary source
Daniel Barrera Salazar, Andrew Graham and Chris Williams, “The non-abelian Leopoldt conjecture and equalities of L-invariants”, arXiv:2603.18961 (2026).
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