Tamagawa number conjecture for (M,OF)(M,\mathcal{O}_F) in analytic rank zero

Let MM be a critical motive over KK with coefficient field F\mathcal{F}, let F=FλF=\mathcal{F}_\lambda, and let TT be a stable OF\mathcal{O}_F-lattice in the associated representation VV. Assume the Bloch–Kato Selmer groups Hf1(K,V)H^1_f(K,V) and Hf1(K,V(1))H^1_f(K,V^*(1)) vanish. Choose an F\mathcal{F}-basis γF2HB(M)+\gamma\in\bigwedge_\mathcal{F}^2H_B(M)^+ whose comparison image is an OF\mathcal{O}_F-basis of OF2T(1)\bigwedge_{\mathcal{O}_F}^2T^*(1), and let δ\delta^* be the dual basis in F2DdR,p(V)\bigwedge_F^2D_{{\rm dR},\mathfrak{p}}(V). Tamagawa number conjecture. If L(f,χ1,r)0L(f,\chi^{-1},r)\ne0, then Hf1(K,V)=Hf1(K,V(1))=0H^1_f(K,V)=H^1_f(K,V^*(1))=0 and there is an OF\mathcal{O}_F-basis

zγdetOF1(RΓ(GK,S,T))\mathfrak{z}_\gamma\in\det_{\mathcal{O}_F}^{-1}(\mathbf{R}\Gamma(G_{K,S},T))

such that the localization and dual-exponential composition sends zγ\mathfrak{z}_\gamma to

LS(f,χ1,r)Ωγ,δδ.\frac{L_S(f,\chi^{-1},r)}{\Omega_{\gamma,\delta}}\,\delta^*.

Here LSL_S is obtained by removing the Euler factors at places in SS. This is an integral refinement of the Tamagawa number conjecture in analytic rank zero, relating an integral determinant element to the normalized special value of the LL-function. The source gives no resolution.

Sources & referencesView supporting material

Primary source

Takamichi Sano, “On the Tamagawa number conjecture for modular forms twisted by anticyclotomic Hecke characters”, arXiv:2510.01601 (2025).

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