Buzzard–Diamond–Jarvis conjecture for quaternionic mod-pp cohomology

Let FF) be a totally real field and let

ρ:GF:=Gal(Qˉ/F)GL2(Fˉp)\rho: G_F:=\operatorname{Gal}(\mathbb{\bar{Q}}/F)\rightarrow \operatorname{GL}_2(\bar{\mathbb{F}}_p)

be a continuous, irreducible and totally odd representation. Let DD be a quaternion algebra over FF that splits at exactly one infinite place, and let SD[mρ]S^D[\mathfrak{m}_\rho] be the corresponding localized mod-pp cohomology representation of GF×Df×G_F\times D_f^\times. Buzzard–Diamond–Jarvis conjecture. The representation SD[mρ]S^D[\mathfrak{m}_\rho] is isomorphic to a restricted tensor product

SD[mρ]ρ(wπw),S^D[\mathfrak{m}_\rho]\cong \rho\otimes (\otimes'_w\pi_w),

where each πw\pi_w is a smooth admissible representation of Dw×D_w^\times, with the following properties: if ww does not divide pp, then πw\pi_w is the representation attached to ρw:=ρFw\rho_w:=\rho|_{F_w} by the modulo \ell local Langlands or Jacquet–Langlands correspondence; if ww divides pp, then πw0\pi_w\ne 0, and, when both FF and DD are unramified at ww, for every irreducible representation σ\sigma of GL2(OFw)\operatorname{GL}_2(\mathcal{O}_{F_w}),

HomGL2(OFw)(σ,πw)0\operatorname{Hom}_{\operatorname{GL}_2(\mathcal{O}_{F_w})}(\sigma,\pi_w)\ne 0

if and only if σW(ρw)\sigma\in W(\rho_w), where W(ρw)W(\rho_w) is the associated set of Serre weights. This conjecture predicts a precise local–global description of mod-pp automorphic forms and relates the local factors at places above pp to Serre weights; the source does not state a resolution.

Sources & referencesView supporting material

Primary source

Debargha Banerjee and Vivek Rai, “Towards a mod-p Lubin-Tate theory for _2 over totally real fields”, arXiv:2206.09706 (2022).

Additional references

4 papers in this index state this conjecture (2007–2022). The statement above is taken from the most recent of them; the others are arXiv:1602.08827, arXiv:0810.1877, arXiv:0705.1213.

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