The conjectural reciprocity law for rigid meromorphic cocycles

Fix open subgroups UpG(Ap,)U^p\subseteq G(\mathbb{A}^{p,\infty}) and UpG(Qp)U_p\subseteq G(\mathbb{Q}_p) containing G(Qp)+G(\mathbb{Q}_p)^+, and put U=UpUpG(R)+U=U^pU_pG(\mathbb{R})^+. For a coset hG(A)/Uh\in G(\mathbb{A})/U, let Γh=G(Q)hUh1\Gamma_h=G(\mathbb{Q})\cap hUh^{-1}. Let (x,h)(\vec{x},h) be an oriented adelic special point, let Cx,hC_{x,h} be its associated relative class group, let Hx,h/ExH_{x,h}/E_x be the corresponding abelian extension, and let EUE_U be the field appearing in the source. Write t(x,h)t\star(\vec{x},h) for the class-group action and rec:Cx,hGal(Hx,h/Ex)\operatorname{rec}:C_{x,h}\to\operatorname{Gal}(H_{x,h}/E_x) for the Artin reciprocity map. Conjectural reciprocity law. For every rigid meromorphic cocycle JRMC(Γh)J\in\mathcal{RMC}(\Gamma_h) of level Γh\Gamma_h, there exists a finitely generated submodule ΠJQp×\Pi_J\subseteq \mathbb{Q}_p^\times of rank less than or equal to the rank of Hs(Γh,Z)H^s(\Gamma_h,\mathbb{Z}) such that

J[(x,h)]Hx,hEUΠJJ[(\vec{x},h)]\in H_{x,h}E_U\Pi_J

for every oriented special pair (x,h)(\vec{x},h) at which JJ is regular. Moreover, for every αΠJ\alpha\in\Pi_J such that J[(x,h)]/αHx,hEUJ[(\vec{x},h)]/\alpha\in H_{x,h}E_U, there exists αΠJ\alpha'\in\Pi_J such that

rec(t)(J[(x,h)]α)=J[t(x,h)]αtCx,hU.\operatorname{rec}(t)\left(\frac{J[(\vec{x},h)]}{\alpha}\right)=\frac{J[t\star(\vec{x},h)]}{\alpha'}\quad\forall t\in C_{x,h}^{U}.

This is an analogue of Shimura reciprocity: the values of rigid meromorphic cocycles at adelic special pairs should be defined over the predicted class-field-theoretic extensions, up to the finitely generated ambiguity ΠJ\Pi_J, with Galois action compatible with the class-group action. The source presents this as conjectural and gives no resolution.

Sources & referencesView supporting material

Primary source

Henri Darmon, Lennart Gehrmann and Michael Lipnowski, “Rigid meromorphic cocycles for orthogonal groups”, arXiv:2308.14433 (2023).

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