Kurihara’s strong Mazur–Tate conjecture for Selmer-group Fitting ideals

Let EE be an elliptic curve with good ordinary reduction at an odd prime pp, let θn(f)\theta_n(f) be the Mazur–Tate element attached to the modular form ff associated with EE at Q(n)\mathbf{Q}^{(n)}, and let Λn=Zp[Gal(Q(n)/Q)]\Lambda_n=\mathbf{Z}_p[\operatorname{Gal}(\mathbf{Q}^{(n)}/\mathbf{Q})]. Write Sel(Q(n),E[p])\operatorname{Sel}(\mathbf{Q}^{(n)},E[p^\infty]) for the pp^\infty-Selmer group. Strong Mazur–Tate conjecture. If ap≢1(modp)a_p\not\equiv 1\pmod p and pp does not divide the Tamagawa number of EE, then

(θn(f))=FittΛn(HomZp(Sel(Q(n),E[p]),Qp/Zp)).(\theta_n(f))=\operatorname{Fitt}_{\Lambda_n}\left(\operatorname{Hom}_{\mathbf{Z}_p}(\operatorname{Sel}(\mathbf{Q}^{(n)},E[p^\infty]),\mathbf{Q}_p/\mathbf{Z}_p)\right).

This strengthens the weak Mazur–Tate conjecture by asserting that the Mazur–Tate element generates the entire Fitting ideal. The source states that Kim and Kurihara proved this under additional hypotheses, including the Iwasawa main conjecture over Q\mathbf{Q}_\infty; the candidate itself is therefore recorded as solved.

Sources & referencesView supporting material

Primary source

Cédric Dion, “Refined conjectures on Fitting ideals of Selmer groups over Z_p^2-extensions”, arXiv:2405.15076 (2024).

Additional references

2 papers in this index state this conjecture (2018–2024). The statement above is taken from the most recent of them; the others are arXiv:1804.00418.

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