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\(\Lambda \)-submodules of finite index of anticyclotomic plus and minus Selmer groups of elliptic curves

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Abstract

Let p be an odd prime and K an imaginary quadratic field where p splits. Under appropriate hypotheses, Bertolini showed that the Selmer group of a p-ordinary elliptic curve over the anticyclotomic \({\mathbb {Z}}_p\)-extension of K does not admit any proper \(\Lambda \)-submodule of finite index, where \(\Lambda \) is a suitable Iwasawa algebra. We generalize this result to the plus and minus Selmer groups (in the sense of Kobayashi) of p-supersingular elliptic curves. In particular, in our setting the plus/minus Selmer groups have \(\Lambda \)-corank one, so they are not \(\Lambda \)-cotorsion. As an application of our main theorem, we prove results in the vein of Greenberg–Vatsal on Iwasawa invariants of p-congruent elliptic curves, extending to the supersingular case results for p-ordinary elliptic curves due to Hatley–Lei.

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Acknowledgements

We thank Mirela Çiperiani and Matteo Longo for interesting discussions on some of the topics of this paper. We are also grateful to the anonymous referee for several helpful suggestions which clarified some proofs and otherwise improved the exposition of the paper.

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Correspondence to Jeffrey Hatley.

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The second named author’s research is supported by the NSERC Discovery Grants Program RGPIN-2020-04259 and RGPAS-2020-00096. The third named author’s research is partially supported by PRIN 2017 “Geometric, algebraic and analytic methods in arithmetic”

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Hatley, J., Lei, A. & Vigni, S. \(\Lambda \)-submodules of finite index of anticyclotomic plus and minus Selmer groups of elliptic curves. manuscripta math. 167, 589–612 (2022). https://doi.org/10.1007/s00229-021-01283-w

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