Global rationality and Shimura reciprocity conjecture for Stark–Heegner cycles

Let Vp(f)V_p(f) be the two-dimensional representation attached to a Bianchi modular form, assume that Vp(f)GFpV_p(f)|_{G_{F_{\mathfrak p}}} is semistable, and let p\mathfrak p, KK, HCH_{\mathcal C}, HχH_\chi, LL, O\mathcal O, R\mathcal R, C\mathcal C, Ψ\Psi, SΨ\mathcal S_\Psi, sΨ\mathfrak s_\Psi, and sχ\mathfrak s_\chi be as in the source. Write resp\operatorname{res}_{\mathfrak p} for the restriction map from the global semistable Bloch–Kato Selmer group to the local semistable cohomology group. Global rationality conjecture. (i) For every optimal embedding ΨEmb(O,R)\Psi\in\operatorname{Emb}(\mathcal O,\mathcal R) of conductor C\mathcal C relatively prime to NDK\mathcal N\mathcal D_K, there exists

SΨSelst(HC,Vp(f)(k+22))\mathcal S_\Psi\in\operatorname{Sel}_{\mathrm{st}}\left(H_{\mathcal C},V_p(f)\left(\frac{k+2}{2}\right)\right)

with

sΨ=resp(SΨ).\mathfrak s_\Psi=\operatorname{res}_{\mathfrak p}(\mathcal S_\Psi).

(ii) For every ΨEmb(O,R)\Psi\in\operatorname{Emb}(\mathcal O,\mathcal R) and aPic(O)\mathfrak a\in\operatorname{Pic}(\mathcal O), if τ=rec(a)\tau=\operatorname{rec}(\mathfrak a), then

resp(SΨτ)=saΨ.\operatorname{res}_{\mathfrak p}(\mathcal S_\Psi^\tau)=\mathfrak s_{\mathfrak a\cdot\Psi}.

(iii) For every character χ:Gal(HC/K)C×\chi:\operatorname{Gal}(H_{\mathcal C}/K)\to\mathbb C^\times, there exists

SχSelst(Hχ,Vp(f)(k+22))χ\mathcal S_\chi\in\operatorname{Sel}_{\mathrm{st}}\left(H_\chi,V_p(f)\left(\frac{k+2}{2}\right)\right)^\chi

with resp(Sχ)=sχ\operatorname{res}_{\mathfrak p}(\mathcal S_\chi)=\mathfrak s_\chi, where HχH_\chi is the abelian subextension cut out by χ\chi and the superscript χ\chi denotes the χ\chi-isotypical subspace. The conjecture asserts that the constructed local Stark–Heegner classes are globally rational and obey Shimura reciprocity; the source presents it as the main conjecture and gives no resolution.

Sources & referencesView supporting material

Primary source

Guhan Venkat and Chris Williams, “Stark-Heegner cycles attached to Bianchi modular forms”, arXiv:1910.14581 (2020).

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