Geometric Breuil--Mézard conjecture for GSp4\mathrm{GSp}_4 deformation rings

Let GKG_K be the absolute Galois group of KK, let ρ:GKGSp4(F)\overline{\rho}:G_K\rightarrow\mathrm{GSp}_4(\mathbf{F}) be continuous, and let RρR_{\overline{\rho}}^\square be its framed deformation ring. For each Serre weight σ\sigma, let ZσZ_\sigma be a cycle of dimension 4f+114f+11 in SpecRρ/ϖ\operatorname{Spec}R_{\overline{\rho}}^\square/\varpi. For a regular Hodge type λ\lambda and a mildly generic tame inertial type τ\tau, write Z(Rρλ,τ/ϖ)Z(R_{\overline{\rho}}^{\lambda,\tau}/\varpi) for the corresponding cycle and [σ(τ)V(λη):σ][\overline{\sigma(\tau)\otimes V(\lambda-\eta)}:\sigma] for the Jordan--Hölder multiplicity. Geometric Breuil--Mézard conjecture.

Z(Rρλ,τ/ϖ)=σ[σ(τ)V(λη):σ]Zσ.Z(R_{\overline{\rho}}^{\lambda,\tau}/\varpi)=\sum_\sigma[\overline{\sigma(\tau)\otimes V(\lambda-\eta)}:\sigma]Z_\sigma.

The source states this conjecture for the tamely potentially crystalline case and says that it is proved under appropriate genericity assumptions.

Sources & referencesView supporting material

Primary source

Heejong Lee, “Emerton–Gee stacks, Serre weights, and Breuil–Mézard conjectures for GSp_4”, arXiv:2304.13879 (2026).

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