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arXiv 1812.04425math.ATmath.AG
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模形式环与$TMF_0(7)$的分裂

Rings of modular forms and a splitting of $TMF_0(7)$

Lennart Meier, Viktoriya Ozornova

摘要:

在具有水平结构的拓扑模形式中,素$3$上的$TMF_0(7)$是第一个尚未被理解的例子。我们提供了一个分裂的$TMF_0(7)$在素数3作为$TMF$ -模成两个移位的副本$TMF$和两个移位的副本$TMF_1(2)$。这证明了一个更一般的分裂猜想。一路上,我们开发了几个新的结果在代数方面。例如,我们证明了$n$层的模形式的环的正规性,并引入了具有水平结构的椭圆曲线的模栈的立方形式。

英文摘要:

Among topological modular forms with level structure, $TMF_0(7)$ at the prime $3$ is the first example that had not been understood yet. We provide a splitting of $TMF_0(7)$ at the prime 3 as $TMF$-module into two shifted copies of $TMF$ and two shifted copies of $TMF_1(2)$. This gives evidence to a much more general splitting conjecture. Along the way, we develop several new results on the algebraic side. For example, we show the normality of rings of modular forms of level $n$ and introduce cubical versions of moduli stacks of elliptic curves with level structure.

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