The analogue of Coates–Sujatha's fine Selmer conjecture over function fields

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Let KK be the function field considered in the paper, let LL be a finite extension of KK, and let LcycL_\mathrm{cyc} be its cyclotomic extension. For an elliptic curve E/LE/L, let R(E/Lcyc)R(E/L_\mathrm{cyc}) denote the fine Selmer group and let R(E/Lcyc)∨R(E/L_\mathrm{cyc})^{\vee} be its Pontryagin dual. The analogue of Conjecture A. For every elliptic curve E/LE/L,

R(E/Lcyc)∨ is a finitely generated Zp-module.R(E/L_\mathrm{cyc})^{\vee}\text{ is a finitely generated }\mathbb Z_p\text{-module}.

This is proposed as the function-field analogue of the number-field fine Selmer conjecture. The surrounding text places it in the characteristic-pp function-field setting and reports results establishing analogous statements in the cases treated by the paper.

References

Primary source

Sohan Ghosh, Somnath Jha and Sudhanshu Shekhar, “Iwasawa theory of fine Selmer groups over global fields”, arXiv:2201.01751 (2025).

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