Darmon–Harris–Venkatesh Stark-unit conjecture for the derived Hecke pairing

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Let RR be the ring of integers of LL, with 6N6N inverted, and let gg be the weight-one form with associated representation ρg\rho_g. Define

G(z):=TrNNd(g(z)g∗(Nz))∈S2(N;R)=H0(X0(N)/R,Ω1).G(z):=\mathsf{Tr}^{Nd}_{N}(g(z)g^*(Nz))\in S_2(N;R)=H^0(X_0(N)_{/R},\Omega^1).

Let S\mathfrak{S} be the Shimura class, let ⟨G,S⟩∈R/pt\langle G,\mathfrak{S}\rangle\in R/p^t be the pairing obtained from Serre duality, let HH be the finite extension of Q\mathbb{Q} cut out by Ad⁡(ρg)\operatorname{Ad}(\rho_g), and set

Ug:=(OH×⊗Ad⁡∗(ρg)∘)GQ.U_g:=({\mathcal O}_H^\times\otimes\operatorname{Ad}^*(\rho_g)^\circ)^{G_{\mathbb Q}}.

For a prime N\mathcal{N} of HH above NN, let

red⁡N:Ug⟶(Z/NZ)×⊗R\operatorname{red}_N:U_g\longrightarrow(\mathbb{Z}/N\mathbb{Z})^\times\otimes R

be the reduction map defined using the Frobenius element σN\sigma_N. Darmon–Harris–Venkatesh Stark-unit conjecture. There exists an integer m=mg≥1m=m_g\geq1 and ug∈Ugu_g\in U_g such that, for all primes NN and pp as above,

m⋅⟨G,S⟩=log⁡(redN(ug)).m\cdot\langle G,\mathfrak{S}\rangle=\log(\mathrm{red}_N(u_g)).

This conjecture relates a derived-Hecke or Serre-duality pairing to the discrete logarithm of a Stark unit associated with gg. The source presents it as a version of the main conjecture of the cited work and does not state that it has been resolved.

References

Primary source

Henri Darmon, Michael Harris, Victor Rotger and Akshay Venkatesh, “The derived Hecke algebra for dihedral weight one forms”, arXiv:2207.01304 (2022).

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