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arXiv 1208.3476hep-thmath.NT
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弦论中黑洞简并的正性

On the positivity of black hole degeneracies in string theory

Kathrin Bringmann, Sameer Murthy

摘要:

本文用显式弱耦合微观描述精确计算了N=4和N=8超弦理论中荷电态的螺旋度迹指数。这些指标预计将计算携带相同电荷的黑洞的精确量子简并。为了使这种解释是一致的,这些指数应该是正整数。我们证明了一类在T^6/T^5和K3 \times T^2/S^1上紧化的II型弦论中的四维/五维黑洞的正性性质.证明依赖于相应的生成函数的模拟模块属性。

英文摘要:

Certain helicity trace indices of charged states in N=4 and N=8 superstring theory have been computed exactly using their explicit weakly coupled microscopic description. These indices are expected to count the exact quantum degeneracies of black holes carrying the same charges. In order for this interpretation to be consistent, these indices should be positive integers. We prove this positivity property for a class of four/five dimensional black holes in type II string theory compactified on T^6/T^5 and on K3 \times T^2/S^1. The proof relies on the mock modular properties of the corresponding generating functions.

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