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

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,SR/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

redN: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=mg1m=m_g\geq1 and ugUgu_g\in U_g such that, for all primes NN and pp as above,

mG,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.

Sources & referencesView supporting material

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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