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arXiv 1208.4074hep-thmath.NT
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量子黑洞、穿墙和模模形式

Quantum Black Holes, Wall Crossing, and Mock Modular Forms

Atish Dabholkar, Sameer Murthy, Don Zagier

摘要:

我们证明了在N=4弦论中计算四分之一BPS态的亚纯Jacobi形式可以正则地分解为一个模拟Jacobi形式和一个Appell-Lerch和的和。单中心黑洞的量子简并度是这种模拟Jacobi形式的傅立叶系数,而Appell-Lerch和捕获了多中心黑洞的简并度,这些黑洞在跨壁时衰减。模拟雅可比形式的完成恢复了预期从$AdS_3/CFT_2$全息的模对称性,但具有反映微观CFT的非紧凑性的全纯异常。对于每一个正整数值m的磁荷不变量的黑洞,我们的分析导致一个特殊的模拟雅可比形式的重量为2和指数为m,我们唯一的特征到雅可比尖点形式。这个特殊形式的家族和另一个密切相关的重量1形式家族包含几乎所有已知的模拟模形式,包括Ramanujan的模拟theta函数,Hurwitz-Kronecker类数的生成函数,Mathieu和Umbral moonshine中出现的模拟模形式,以及无限多的新例子。

英文摘要:

We show that the meromorphic Jacobi form that counts the quarter-BPS states in N=4 string theories can be canonically decomposed as a sum of a mock Jacobi form and an Appell-Lerch sum. The quantum degeneracies of single-centered black holes are Fourier coefficients of this mock Jacobi form, while the Appell-Lerch sum captures the degeneracies of multi-centered black holes which decay upon wall-crossing. The completion of the mock Jacobi form restores the modular symmetries expected from $AdS_3/CFT_2$ holography but has a holomorphic anomaly reflecting the non-compactness of the microscopic CFT. For every positive integral value m of the magnetic charge invariant of the black hole, our analysis leads to a special mock Jacobi form of weight two and index m, which we characterize uniquely up to a Jacobi cusp form. This family of special forms and another closely related family of weight-one forms contain almost all the known mock modular forms including the mock theta functions of Ramanujan, the generating function of Hurwitz-Kronecker class numbers, the mock modular forms appearing in the Mathieu and Umbral moonshine, as well as an infinite number of new examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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