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arXiv 0907.1625hep-th
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UV完备QFT中的高阶导数引力、因果性和能量正性

Higher Derivative Gravity, Causality and Positivity of Energy in a UV complete QFT

Diego M. Hofman

摘要:

本文讨论了$AdS$体中因果关系所施加的约束与对偶CFT中理想量热计实验中测得的能量为正的条件之间的关系。首先,我们扩展了文献中的分析,并恢复了所有的边界理论的因果关系在体动力学的引力子和规范玻色子场的所有极化的所有限制。这些结果转化为特定的界限的中心荷的比率$\frac{a}{c}$的双重CFT,已经发现通过分析能量一点函数。然后,我们推广了这一讨论,并研究了冲击波背景,在冲击波背景中,我们揭示了体中的因果关系与对偶场论中的三点函数之间的关系。我们注意到,在求解高次引力理论中的经典运动方程时,必须特别注意三点函数的指数化过程,因为并不清楚每个理论都会提出因果关系问题。最后,我们提出了一个场论的论点,解释任何UV完全QFT的能量条件的积极性。

英文摘要:

In this note we discuss the relation between the constraints imposed by causality in the bulk of $AdS$ and the condition of positivity of the energy measured in ideal calorimeters in a collider experiment in the dual CFT. We first extend the analysis in the literature and recover all bounds imposed by causality of the boundary theory in the bulk dynamics for all polarizations of the graviton and the gauge boson field. These results translate to specific bounds for the ratio of central charges $\frac{a}{c}$ in the dual CFT, already found by analyzing the energy one point function. Then, we generalize this discussion and we study shock wave backgrounds in which we make manifest the relation between causality in the bulk and the three point function in the dual field theory. We remark that particular care has to be given to the exponentiation procedure of the three point function when solving the classical equations of motion in the higher gravity theory, as it is not clear that every theory will present causality problems. Finally, we present a field theoretic argument explaining the positivity of energy condition in any UV complete QFT.

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