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arXiv 1208.0337hep-th
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从共形场论到AdS场论

AdS Field Theory from Conformal Field Theory

A. Liam Fitzpatrick, Jared Kaplan

摘要:

本文给出了AdS中的共形场论用微扰有效场论描述的充要条件。前两个条件是众所周知的:存在微扰的“1/N”展开和由有限数量的低维算子生成的状态的近似Fock空间。我们增加了第三个条件,即CFT算子的梅林振幅必须很好地近似于梅林空间中无穷远处多项式所限定的函数,或者换句话说,梅林振幅具有有效的理论型展开。我们解释了我们的条件和幺正性之间的关系,并提供了一个类比与散射振幅,成为精确的平面空间限制的AdS。分析还产生了一个简单的连接保形块和AdS图,提供了一个新的计算工具非常的精神的S矩阵程序。我们也开始探索潜在的病理与更高的自旋领域在AdS推广温伯格的软定理AdS/CFT。温伯格论证的AdS类比限制了CFTs中守恒流的相互作用,但存在着平坦时空中无质量高自旋粒子理论所无法利用的潜在漏洞。

英文摘要:

We provide necessary and sufficient conditions for a Conformal Field Theory to have a description in terms of a perturbative Effective Field Theory in AdS. The first two conditions are well-known: the existence of a perturbative `1/N' expansion and an approximate Fock space of states generated by a finite number of low-dimension operators. We add a third condition, that the Mellin amplitudes of the CFT correlators must be well-approximated by functions that are bounded by a polynomial at infinity in Mellin space, or in other words, that the Mellin amplitudes have an effective theory-type expansion. We explain the relationship between our conditions and unitarity, and provide an analogy with scattering amplitudes that becomes exact in the flat space limit of AdS. The analysis also yields a simple connection between conformal blocks and AdS diagrams, providing a new calculational tool very much in the spirit of the S-Matrix program. We also begin to explore the potential pathologies associated with higher spin fields in AdS by generalizing Weinberg's soft theorems to AdS/CFT. The AdS analog of Weinberg's argument constrains the interactions of conserved currents in CFTs, but there are potential loopholes that are unavailable to theories of massless higher spin particles in flat spacetime.

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