English

The refined Tamagawa number conjectures for $\mathrm{GL}_2$

Number Theory 2025-05-15 v1

Abstract

Let ff be a cuspidal newform and p3p \geq 3 a prime such that the associated pp-adic Galois representation has large image. We establish a new and refined "Birch and Swinnerton-Dyer type" formula for Bloch-Kato Selmer groups of the central critical twist of ff via Kolyvagin derivatives of LL-values instead of complex analytic or pp-adic variation of LL-values only under the Iwasawa main conjecture localized at the augmentation ideal. Our formula determines the exact rank and module structure of the Selmer groups and is insensitive to weight, the local behavior of ff at pp, and analytic rank. As consequences, we prove the non-vanishing of Kato's Kolyvagin system and complete a "discrete" analogue of the Beilinson-Bloch-Kato conjecture for modular forms at ordinary primes. We also obtain the higher weight analogue of the pp-converse to the theorem of Gross-Zagier and Kolyvagin, the pp-parity conjecture, and a new computational upper bound of Selmer ranks. We also discuss how to formulate the refined conjecture on the non-vanishing of Kato's Kolyvagin system for modular forms of general weight. In the appendix with Robert Pollack, we compute several numerical examples on the structure of Selmer groups of elliptic curves and modular forms of higher weight. Sometimes our computation provides a deeper understanding of Selmer groups than what is predicted by Birch and Swinnerton-Dyer conjecture.

Keywords

Cite

@article{arxiv.2505.09121,
  title  = {The refined Tamagawa number conjectures for $\mathrm{GL}_2$},
  author = {Chan-Ho Kim and Robert Pollack},
  journal= {arXiv preprint arXiv:2505.09121},
  year   = {2025}
}

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R2 v1 2026-06-28T23:32:32.575Z