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arXiv 1709.03597hep-th
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来自算子乘积展开的冲击波

Shockwaves from the Operator Product Expansion

Nima Afkhami-Jeddi, Thomas Hartman, Sandipan Kundu, Amirhossein Tajdini

摘要:

我们澄清和进一步探讨CFT对偶的冲击波几何Anti-de Sitter。冲击波是对偶的CFT状态所产生的一个沉重的本地运营商插入在一个复杂的点。它也可以由灯光操作符创建,涂抹在复杂的位置上。我们在这两种情况下描述字典,并比较各种计算,旧的和新的。在CFT中,我们分析了Regge极限下的算子乘积展开,发现主要的贡献正是定域在体测地线上的激波算子$\int du h_{uu}$。对于重源,这是共形不变性的一个简单结果,但对于轻算子,它涉及到一个涂抹过程,将某些双迹贡献投射到OPE。从这个角度来看,我们重新审视因果关系的限制,在大$N$ CFT,并表明,在CFT的混沌界符合Engelhardt和Fischetti提出的散装条件。在特定的状态下,这再现了已知的约束CFT 3点耦合,并确认了一些假设的双重跟踪运营商在以前的工作。

英文摘要:

We clarify and further explore the CFT dual of shockwave geometries in Anti-de Sitter. The shockwave is dual to a CFT state produced by a heavy local operator inserted at a complex point. It can also be created by light operators, smeared over complex positions. We describe the dictionary in both cases, and compare to various calculations, old and new. In CFT, we analyze the operator product expansion in the Regge limit, and find that the leading contribution is exactly the shockwave operator, $\int du h_{uu}$, localized on a bulk geodesic. For heavy sources this is a simple consequence of conformal invariance, but for light operators it involves a smearing procedure that projects out certain double-trace contributions to the OPE. We revisit causality constraints in large-$N$ CFT from this perspective, and show that the chaos bound in CFT coincides with a bulk condition proposed by Engelhardt and Fischetti. In particular states, this reproduces known constraints on CFT 3-point couplings, and confirms some assumptions about double-trace operators made in previous work.

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