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A Sato-Tate group $G$ of degree $d$ is said to be rational if for every irreducible character $\chi$ of $\GL_d(\C)$ and every component $H$ of $G$ we have $$\int_H \chi(g)\mu_H \in \Z,$$ where $\mu_H$ denotes the restriction to $H$ of the Haar measure $\mu$ on $G$, normalized so that $\mu_H(H)=1$. If $G$ is the Sato-Tate group of an arithmetic L-function $$L(s)=\prod_{\mathfrak p}L_\mathfrak{p}(N(\mathfrak{p})^{-s})^{-1},$$ this means that the polynomials $L_{\mathfrak p}(T)$ have integer coefficients.

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• Review status: reviewed
• Last edited by Kiran S. Kedlaya on 2018-06-20 04:07:30
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