Darmon's rationality conjecture with Shimura reciprocity for Darmon points

Fix an integer cc prime to DND\cdot N, let Oc\mathcal{O}_c be the order of the real quadratic field FF of conductor cc, and let QFDc2Q\in\mathcal{F}_{Dc^2} represent a class of quadratic forms defining τQHp(Dc2)\tau_Q\in\mathcal{H}_p^{(Dc^2)}. Let Hc+H_c^+ be the strict ring class field of FF of conductor cc, let Gc+=Gal(Hc+/F)G_c^+=\operatorname{Gal}(H_c^+/F), and fix the localization at the prime above pp. Darmon's Shimura reciprocity conjecture. The Darmon point PτQP_{\tau_Q} is the localization of a global point PcE(Hc+)P_c\in E(H_c^+), and, for every σGc+\sigma\in G_c^+, if PcP_c localizes to PτQP_{\tau_Q}, then PcσP_c^\sigma localizes to PτQσP_{\tau_{Q^\sigma}}. This is the explicit Galois-equivariant form of the rationality conjecture. It describes not only the field of definition of the global point but also the action of the strict ring class field Galois group on its localizations. The source presents it as a conjectural Shimura reciprocity law.

Sources & referencesView supporting material

Primary source

Matteo Longo, Kimball Martin and Yan Hu, “Rationality of Darmon points over genus fields of non-maximal orders”, arXiv:1801.05779 (2020).

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