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Iwasawa Theory, projective modules, and modular representations

About this Title

Ralph Greenberg, Department of Mathematics, University of Washington, Seattle, Washington 98195-4350

Publication: Memoirs of the American Mathematical Society
Publication Year: 2011; Volume 211, Number 992
ISBNs: 978-0-8218-4931-6 (print); 978-1-4704-0609-7 (online)
DOI: https://doi.org/10.1090/S0065-9266-2010-00608-2
Published electronically: September 23, 2010
Keywords: Iwasawa theory for elliptic curves, Noncommutative Iwasawa theory, Iwasawa invariants, Selmer groups, parity conjecture, root numbers.
MSC: Primary 11G05, 11R23; Secondary 20C15, 20C20.

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Table of Contents

Chapters

  • 1. Introduction.
  • 2. Projective and quasi-projective modules.
  • 3. Projectivity or quasi-projectivity of $X_{E}^{\Sigma _{\mbox {\tiny {0}}}}(K_{\infty })$.
  • 4. Selmer atoms.
  • 5. The structure of ${{\mathcal H}}_v(K_{\infty }, E)$.
  • 6. The case where $\Delta$ is a $p$-group.
  • 7. Other specific groups.
  • 8. Some arithmetic illustrations.
  • 9. Self-dual representations.
  • 10. A duality theorem.
  • 11. $p$-modular functions.
  • 12. Parity.
  • 13. More arithmetic illustrations.

Abstract

This paper shows that properties of projective modules over a group ring $\mathbf {Z}_p[\Delta ]$, where $\Delta$ is a finite Galois group, can be used to study the behavior of certain invariants which occur naturally in Iwasawa theory for an elliptic curve $E$. Modular representation theory for the group $\Delta$ plays a crucial role in this study. It is necessary to make a certain assumption about the vanishing of a $\mu$-invariant. We then study $\lambda$-invariants $\lambda _E(\sigma )$, where $\sigma$ varies over the absolutely irreducible representations of $\Delta$. We show that there are non-trivial relationships between these invariants under certain hypotheses.

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