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Let $K$ be a number field with ring of integers $\Z_K$ and let $\mathfrak{m}$ be an integral ideal of $K$. Let $I(\mathfrak{m})$ be the group of fractional ideals of $K$ coprime to $\mathfrak{m}$. A Hecke character modulo $\mathfrak{m}$ is a group homomorphism $\chi:I(\mathfrak{m})\to\mathbb{C}^\times$ with the property there exists another group homomorphism $\chi_\infty:K^\times/\mathbb{Q}^\times\to\mathbb{C}^\times$ such that \[ \chi(\alpha\mathbb{Z}_K)=\chi_\infty(\alpha) \text{ for all }\alpha\in K^\times\text{ such that }\alpha\equiv1 \mod ^*\mathfrak{m}, \] where by $\alpha\equiv1\mod^*{\mathfrak{m}}$ we mean that $v_\mathfrak{p}((\alpha-1))\geq v_\mathfrak{p}(\mathfrak{m})$ for all prime ideals $\mathfrak{p}\mid\mathfrak{m}$.

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  • Review status: beta
  • Last edited by John Jones on 2018-08-06 15:14:04
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