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arXiv 1104.4008math.NT
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Nahm猜想:渐近计算和反例

Nahm's Conjecture: Asymptotic Computations and Counterexamples

Masha Vlasenko, Sander Zwegers

摘要:

我们考虑取决于参数(A、B、C)的某些q-级数,其中A是正定r乘以r矩阵,B是r-向量,C是标量,并询问这些q-级数何时是模形式。维尔纳·纳姆用布洛赫群的挠率给出了一个A的出现的判据。这个猜想由Don Zagier和Michael Terhoeven证明,其中r=1。我们发展他们的方法r>1,并找到了几个新的例子,模形式以及一些反例Nahm猜想。

英文摘要:

We consider certain q-series depending on parameters (A,B,C), where A is a positive definite r times r matrix, B is an r-vector and C is a scalar, and ask when these q-series are modular forms. Werner Nahm conjectured a criterion for which A's can occur, in terms of torsion in the Bloch group. The conjecture was proved by Don Zagier and Michael Terhoeven for r=1. We develop their approach for r>1 and find several new examples of modular forms as well as some counterexamples to Nahm's conjecture.

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