Global divisibility conjecture for Heegner points and Tamagawa numbers

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Let E/QE_{/\mathbb{Q}} be an elliptic curve of conductor NN, let KK be the quadratic imaginary field associated with a Heegner discriminant, and let yK∈E(K)y_K\in E(K) be the corresponding Heegner point. For an odd prime pp, assume

p∤Np\nmid N

and that the mod-pp Galois representation

ρE,p:Gal⁡(Q‾/Q)⟶GL⁡(E[p])\rho_{E,p}:\operatorname{Gal}(\overline{\mathbb{Q}}/\mathbb{Q})\longrightarrow\operatorname{GL}(E[p])

is surjective, equivalently Gal⁡(Q(E[p])/Q)≅GL⁡2(Fp)\operatorname{Gal}(\mathbb{Q}(E[p])/\mathbb{Q})\cong\operatorname{GL}_2(\mathbb{F}_p). Let m∞m_\infty be the non-negative integer measuring the global pp-divisibility of the Heegner points used in Kolyvagin's construction, and let cqc_q be the Tamagawa number of EE at qq. Global divisibility conjecture. If pp satisfies this hypothesis, then

m∞=ord⁡p(∏q∣Ncq).m_\infty=\operatorname{ord}_p\left(\prod_{q\mid N}c_q\right).

This is the reformulation of the Birch and Swinnerton-Dyer formula obtained by comparing Kolyvagin's formula for the pp-primary part of \cyrX(E/K){\cyr X}(E/K) with the conjectural Tamagawa correction factor. The conjecture concerns the relationship between global divisibility of Heegner points and local Tamagawa numbers, and remains open in the source.

References

Primary source

Dimitar P. Jetchev, “Global Divisibility of Heegner Points and Tamagawa Numbers”, arXiv:math/0703431 (2007).

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