Coates–Sujatha fine Selmer group conjecture

Let FF be a number field, let pp be an odd prime, and let FcycF_\text{cyc} be the cyclotomic Zp\mathbb{Z}_p-extension of FF. For an elliptic curve EE over FF, write R(E/Fcyc)R(E/F_\text{cyc}) for its fine Selmer group and R(E/Fcyc)R(E/F_\text{cyc})^\vee for its Pontryagin dual. Coates–Sujatha conjecture. For all elliptic curves EE over FF, the module R(E/Fcyc)R(E/F_\text{cyc})^\vee is finitely generated over Zp\mathbb{Z}_p.

This conjecture connects the structure of fine Selmer groups with Iwasawa's μ=0\mu=0 conjecture. The source presents it as a conjecture of Coates and Sujatha; its resolution status is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Sohan Ghosh, “A Study of Fine Selmer Groups Over Function Fields via Greenberg Neighbourhoods”, arXiv:2506.22002 (2025).

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