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arXiv 1508.02401hep-thgr-qc
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二次曲率引力的Stueckelberg方法及其解耦极限

A Stueckelberg Approach to Quadratic Curvature Gravity and its Decoupling Limits

Kurt Hinterbichler, Mehdi Saravani

摘要:

曲率平方项,当加入到爱因斯坦-希尔伯特作用量和非微扰处理,一般会导致额外的质量标量态和额外的质量自旋2鬼态的传播。利用施图克尔伯格技巧,我们研究了在强耦合标度保持不变的情况下,自旋2态的质量取为零的高能极限。施图克尔伯格的方法使得幽灵引力子和健康引力子之间的相互作用变得透明,这使得理论能够避开通常的大质量引力的λ-3强耦合标度,并以牺牲稳定性为代价变得可重整化。

英文摘要:

Curvature squared terms, when added to the Einstein-Hilbert action and treated non-perturbatively, generically result in the propagation of an extra massive scalar state and an extra massive spin-2 ghost state. Using the Stueckelberg trick, we study the high-energy limit in which the mass of the spin-2 state is taken to zero, with strong- coupling scales held fixed. The Stueckelberg approach makes transparent the interplay between the ghost graviton and the healthy graviton which allows the theory to evade the usual lambda-3 strong coupling scale of massive gravity and become renormalizable, at the expense of stability.

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