The ratios conjecture for the second family of elliptic curves

Let F(X){\mathcal F}(X) be the second family of elliptic curves under consideration, with conductor parameter C(t)C(t). Define

Y(α,γ):=ζ(1+2γ)ζ(1+γ)ζ(1+α+γ)ζ(1+α)Y(\alpha,\gamma):=\frac{\zeta(1+2\gamma)\zeta(1+\gamma)}{\zeta(1+\alpha+\gamma)\zeta(1+\alpha)}

and let A(α,γ)A(\alpha,\gamma) be the analytic Euler product specified by the factorization of H(α,γ)H(\alpha,\gamma). Let ε>0\varepsilon>0, with Re(α)>1/4{\rm Re}(\alpha)>-1/4, Re(γ)1/logX{\rm Re}(\gamma)\gg 1/\log X, and Im(α),Im(γ)εX1ε{\rm Im}(\alpha),{\rm Im}(\gamma)\ll_\varepsilon X^{1-\varepsilon}. Ratios Conjecture.

1F(X)EtF(X)L(12+α,Et)L(12+γ,Et)=1F(X)EtF(X)[Y(α,γ)A(α,γ)(C(t)2π)2αΓ(1α)Γ(1+α)Y(α,γ)A(α,γ)]+O(X1/2+ε).\begin{aligned} \frac{1}{|{\mathcal F}(X)|}\sum_{E_t\in{\mathcal F}(X)}\frac{L(\frac12+\alpha,E_t)}{L(\frac12+\gamma,E_t)} ={}&\frac{1}{|{\mathcal F}(X)|}\sum_{E_t\in{\mathcal F}(X)}\left[Y(\alpha,\gamma)A(\alpha,\gamma) -\left(\frac{\sqrt{C(t)}}{2\pi}\right)^{-2\alpha}\frac{\Gamma(1-\alpha)}{\Gamma(1+\alpha)}Y(-\alpha,\gamma)A(-\alpha,\gamma)\right]\\ &+O(X^{-1/2+\varepsilon}). \end{aligned}

This is the ratios prediction for the second elliptic-curve family, whose arithmetic factor contains the additional zeta factors arising from the character χ4\chi_4. The stated error term and shift range are conjectural.

Sources & referencesView supporting material

Primary source

Chantal David, Duc Khiem Huynh and James Parks, “One-level density of families of elliptic curves and the Ratios Conjectures”, arXiv:1309.1027 (2013).

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