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arXiv 1606.02728hep-th
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Einstein-Gauss-Bonnet引力中的临界性:没有引力子的引力

Criticality in Einstein-Gauss-Bonnet Gravity: Gravity without Graviton

Zhong-Ying Fan, Bin Chen, Hong Lu

摘要:

具有宇宙学常数的广义Einstein-Gauss-Bonnet引力允许两个(A)dS时空作为其真空解。我们发现在参数空间中的一个临界点,两个(A)dS时空合并成一个和线性化的扰动缺乏任何双线性动力学项。因此,真空微扰在临界点上不再被解释为线性引力子模。然而,临界理论承认由于非线性效应的黑洞解。我们还考虑了爱因斯坦引力扩展一般二次曲率不变量,并获得临界点的理论没有双线性动力学项的标量跟踪模式或横向模式。这种临界现象预计将经常发生在一般的高阶导数重力。

英文摘要:

General Einstein-Gauss-Bonnet gravity with a cosmological constant allows two (A)dS spacetimes as its vacuum solutions. We find a critical point in the parameter space where the two (A)dS spacetimes coalesce into one and the linearized perturbations lack any bilinear kinetic terms. The vacuum perturbations hence loose their interpretation as linear graviton modes at the critical point. Nevertheless, the critical theory admits black hole solutions due to the nonlinear effect. We also consider Einstein gravity extended with general quadratic curvature invariants and obtain critical points where the theory has no bilinear kinetic terms for either the scalar trace mode or the transverse modes. Such critical phenomena are expected to occur frequently in general higher derivative gravities.

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