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On the Tamagawa number conjecture for modular forms twisted by anticyclotomic Hecke characters

Number Theory 2025-10-03 v1

Abstract

Let fS2r(Γ0(N))f \in S_{2r}(\Gamma_0(N)) be a normalized newform of weight 2r2r which is good at pp. Let KK be an imaginary quadratic field of class number one in which every prime divisor of pNpN splits. Let χ\chi be an anticyclotomic Hecke character of KK which is crystalline at the primes above pp and such that L(f,χ,r)0L(f,\chi,r)\neq 0. We prove that the Tamagawa number conjecture for the critical value L(f,χ,r)L(f,\chi,r) follows from the Iwasawa main conjecture for the Bertolini-Darmon-Prasanna pp-adic LL-function.

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Cite

@article{arxiv.2510.01601,
  title  = {On the Tamagawa number conjecture for modular forms twisted by anticyclotomic Hecke characters},
  author = {Takamichi Sano},
  journal= {arXiv preprint arXiv:2510.01601},
  year   = {2025}
}

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48 pages