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arXiv 1407.6008hep-th
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庞加莱系列、三维重力和CFT光谱学

Poincare Series, 3D Gravity and CFT Spectroscopy

Christoph A. Keller, Alexander Maloney

摘要:

模不变性对二维共形场论的态谱有很强的约束作用。通过对模群的图像求和,我们构造了具有模不变和正谱的候选CFT配分函数。这使我们能够有效地提取由模不变性施加的CFT谱上的约束,给出超越渐近态密度的Cardy增长的谱上的信息。我们构造的一些候选模不变配分函数具有大小为(c-1)/12的间隙,证明这种大小和更小的间隙与模不变性一致。我们还重新讨论了AdS 3中纯爱因斯坦引力的配分函数,它具有两个非物理特征:连续性和态密度非正定性。我们表明,这两个可以解决通过添加校正的光谱是subleading在半经典(大中心荷)的限制。

英文摘要:

Modular invariance strongly constrains the spectrum of states of two dimensional conformal field theories. By summing over the images of the modular group, we construct candidate CFT partition functions that are modular invariant and have positive spectrum. This allows us to efficiently extract the constraints on the CFT spectrum imposed by modular invariance, giving information on the spectrum that goes beyond the Cardy growth of the asymptotic density of states. Some of the candidate modular invariant partition functions we construct have gaps of size (c-1)/12, proving that gaps of this size and smaller are consistent with modular invariance. We also revisit the partition function of pure Einstein gravity in AdS3 obtained by summing over geometries, which has a spectrum with two unphysical features: it is continuous, and the density of states is not positive definite. We show that both of these can be resolved by adding corrections to the spectrum which are subleading in the semi-classical (large central charge) limit.

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