THE EISENSTEIN IDEAL OF WEIGHT k AND RANKS OF HECKE ALGEBRAS

THE EISENSTEIN IDEAL OF WEIGHT k AND RANKS OF HECKE ALGEBRAS
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爱森斯坦权 k 理想和赫克代数阶

DOI:
10.1017/s1474748023000129
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发表时间:
2021
影响因子:
0.9
通讯作者:
Shaunak V. Deo
Shaunak V. Deo
中科院分区:
数学1区
文献类型:
--
作者:
Shaunak V. Deo

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<jats:p>让 <jats:italic>p</jats:italic> 和 <jats:inline-formula> <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline1.png" /> <jats:tex-math> $\ell$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 是素数,使得 <jats:inline-formula> <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline2.png" /> <jats:tex-math> $p> 3$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 和 <jats:inline-formula> <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline3.png" /> <jats:tex-math> $p \mid \ell -1$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 和 <jats:italic>k</jats:italic> 是偶数。我们使用伪表示的变形理论来研究作用于权重 <jats:italic>k</jat:italic> 和水平 <jats:inline-formula> 尖模形式空间的 Hecke 代数的完备性 <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline4.png" /> <jats:tex-math> $\伽玛_0(\ell)$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 位于包含 <jats:italic>p</jats:italic> 的最大爱森斯坦理想。我们给出 <jats:inline-formula> 的充分必要条件 <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline5.png" /> <jats:tex-math> $\mathbb {Z}_p$ </jats:tex-math> </jats:替代品> </jats:inline-formula> - 该 Hecke 代数的秩大于 <jats:inline-formula> <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline6.png" /> <jats:tex-math> $1$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 就某些全局伽罗瓦上同调类的杯积消失而言。我们还恢复了 Wake 和 Wang-Erickson 针对 <jats:inline-formula> 证明的一些结果 <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline7.png" /> <jats:tex-math> $k=2$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 使用我们的方法。另外,我们证明了一些<jats:inline-formula> <贾茨:替代品> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline8.png" /> <jats:tex-math> $R=\mathbb {T}$ </jats:tex-math> </jats:替代品> </jats:inline-formula> 某些假设下的定理。</jats:p>
<jats:p>Let <jats:italic>p</jats:italic> and <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline1.png" /> <jats:tex-math> $\ell $ </jats:tex-math> </jats:alternatives> </jats:inline-formula> be primes such that <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline2.png" /> <jats:tex-math> $p> 3$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline3.png" /> <jats:tex-math> $p \mid \ell -1$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:italic>k</jats:italic> be an even integer. We use deformation theory of pseudo-representations to study the completion of the Hecke algebra acting on the space of cuspidal modular forms of weight <jats:italic>k</jats:italic> and level <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline4.png" /> <jats:tex-math> $\Gamma _0(\ell )$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> at the maximal Eisenstein ideal containing <jats:italic>p</jats:italic>. We give a necessary and sufficient condition for the <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline5.png" /> <jats:tex-math> $\mathbb {Z}_p$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-rank of this Hecke algebra to be greater than <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline6.png" /> <jats:tex-math> $1$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> in terms of vanishing of the cup products of certain global Galois cohomology classes. We also recover some of the results proven by Wake and Wang-Erickson for <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline7.png" /> <jats:tex-math> $k=2$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> using our methods. In addition, we prove some <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S1474748023000129_inline8.png" /> <jats:tex-math> $R=\mathbb {T}$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> theorems under certain hypotheses.</jats:p>
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