Effective Lagrangian in de Sitter Spacetime
Effective Lagrangian in de Sitter Spacetime
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德西特时空中的有效拉格朗日
DOI：
10.1103/physrevd.95.025017
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Yoshihia Kitazawa
中科院分区：
文献类型：
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作者：
Hiroyuki Kitamoto;Yoshihia Kitazawa
度规的标度不变涨落是de Sitter时空中量子引力的普遍特征。我们构造了一个有效的拉格朗日量，通过整合超视界度规涨落，总结了它们对局域物理的影响。结果表明，红外量子效应是局域的，并使基本耦合依赖于时间。我们施加洛伦兹不变性的有效拉格朗日，因为它是由一般协方差原理所要求的。我们表明，这样的要求导致独特的物理预测，通过固定的量化模糊性。我们解释了如何规范参数的可观测量的依赖被取消。特别是耦合的相对演化速度是规范不变的。
Scale invariant fluctuations of metric are a universal feature of quantum gravity in de Sitter spacetime. We construct an effective Lagrangian which summarizes their implications on local physics by integrating superhorizon metric fluctuations. It shows infrared quantum effects are local and render fundamental couplings time dependent. We impose Lorenz invariance on the effective Lagrangian as it is required by the principle of general covariance. We show that such a requirement leads to unique physical predictions by fixing the quantization ambiguities. We explain how the gauge parameter dependence of observables is canceled. In particular the relative evolution speed of the couplings are shown to be gauge invariant.