非同余尖点形的傅里叶系数
Fourier coefficients of noncongruence cuspforms
摘要:
给定$\mathbb Q$上定义的模曲线的$SL_2(\mathbb Z)$的有限指数子群,在权$k$($ \ge 2$)尖点形式空间是$1$维的假设下,证明了在该空间中的形式有界乘子当且仅当它是同余模形式,其中傅里叶系数在$\mathbb Q$中.
英文摘要:
Given a finite index subgroup of $SL_2(\mathbb Z)$ with modular curve defined over $\mathbb Q$, under the assumption that the space of weight $k$ ($ \ge 2$) cusp forms is $1$-dimensional, we show that a form in this space with Fourier coefficients in $\mathbb Q$ has bounded denominators if and only if it is a congruence modular form.
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