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arXiv 2008.07942hep-thgr-qc
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偶维弯曲时空中AdS/CFT对偶的平均零能条件

The averaged null energy conditions in even dimensional curved spacetimes from AdS/CFT duality

Norihiro Iizuka, Akihiro Ishibashi, Kengo Maeda

摘要:

在AdS/CFT对偶性的背景下,应用非体积捷径原理,研究偶(2维和4维)弯曲时空中强耦合量子场论的平均零能条件(ANEC).在相同的上下文中,但在奇数维,本作者以前推导出共形不变的平均零能量条件(CANEC),这是一个版本的ANEC具有一定的权函数的共形不变性。然而,在偶数维中,人们必须处理引力共形反常,这使得相关的公式比奇数维的情况复杂得多。在二维情况下,我们通过应用无体积捷径原理推导出ANEC。在四维,我们推导出一个不等式,它本质上提供了一个权重函数的ANEC的下界。为了这个目的,也得到一些几何的见解,重力共形异常,我们表示的应力-能量公式的几何量,如边界零测地线和准本地质量的边界几何的扩展。我们认为,当达到最低限度,也讨论了零能量的平均值可以是负的,考虑一个简单的例子,一个空间紧凑的宇宙与虫洞喉。

英文摘要:

We consider averaged null energy conditions (ANEC) for strongly coupled quantum field theories in even (two and four) dimensional curved spacetimes by applying the no-bulk-shortcut principle in the context of the AdS/CFT duality. In the same context but in odd-dimensions, the present authors previously derived a conformally invariant averaged null energy condition (CANEC), which is a version of the ANEC with a certain weight function for conformal invariance. In even-dimensions, however, one has to deal with gravitational conformal anomalies, which make relevant formulas much more complicated than the odd-dimensional case. In two-dimensions, we derive the ANEC by applying the no-bulk-shortcut principle. In four-dimensions, we derive an inequality which essentially provides the lower-bound for the ANEC with a weight function. For this purpose, and also to get some geometric insights into gravitational conformal anomalies, we express the stress-energy formulas in terms of geometric quantities such as the expansions of boundary null geodesics and a quasi-local mass of the boundary geometry. We argue when the lowest bound is achieved and also discuss when the averaged value of the null energy can be negative, considering a simple example of a spatially compact universe with wormhole throat.

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