The critical order of certain Hecke L-functions of imaginary quadratic fields

Details The critical order of certain Hecke L-functions of imaginary quadratic fields The critical order of certain Hecke L-functions of imaginary quadratic fields

2002-10-21

arxiv.org/abs/math/0210313v1

Mathematics

Number Theory

Scientific paper

Let $-D < -4$ denote a fundamental discriminant which is either odd or divisible by 8, so that the canonical Hecke character of $\Bbb Q(\sqrt{-D})$ exists. Let $d$ be a fundamental discriminant prime to $D$. Let $2k-1$ be an odd natural integer prime to the class number of $\Bbb Q(\sqrt{-D})$. Let $\chi$ be the twist of the $(2k-1)$th power of a canonical Hecke character of $\Bbb Q(\sqrt{-D})$ by the Kronecker's symbol $n\mapsto(\frac{d}{n})$. It is proved that the order of the Hecke $L$-function $L(s,\chi)$ at its central point $s=k$ is determined by its root number when $|d| \leq c(\epsilon)D^{{1/24}-\epsilon}$ or, when $|d| \leq c(\epsilon)D^{\frac1{12} -\epsilon}$ and $k\geq 2$, where $\epsilon > 0$ and $c(\epsilon)$ is a constant depending only on $\epsilon$.

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