Adjoint motives of modular forms and the Tamagawa number conjecture

Abstract

Let $f$ be a newform of weight $k\ge 2$, level $N$ with coefficients in a number field $K$, and $A$ the adjoint motive of the motive $M$ associated to $f$. We carefully discuss the construction of the realisations of $M$ and $A$, as well as natural integral structures in these realisations. We then use the method of Taylor and Wiles to verify the $\lambda$-part of the Tamagawa number conjecture of Bloch and Kato for $L(A,0)$ and $L(A,1)$. Here $\lambda$ is any prime of $K$ not dividing $Nk!$, and so that the mod $\lambda$ representation associated to $f$ is absolutely irreducible when restricted to the Galois group over $\mathbb{Q}(\sqrt{(-1{)}^{(\ell -1)/2}\ell })$ where $\lambda \mid \ell$. The method also establishes modularity of all lifts of the mod $\lambda$ representation which are crystalline of Hodge-Tate type $(0,k-1)$.

109 pages. This is the longer version of the paper: The Tamagawa number conjecture of adjoint motives of modular forms, Ann. Sci. École Norm. Sup. (4) 37 (2004), no. 5, 663-727. This version contains details in the foundational part (Section 1) that were not included in the published version