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arXiv 0912.1608hep-thastro-ph.COgr-qc
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超哈勃de Sitter涨落与动力学RG

Super-Hubble de Sitter Fluctuations and the Dynamical RG

C. P. Burgess, L. Leblond, R. Holman, S. Shandera

摘要:

由于超哈勃尺度上的涨落性质,对德西特时空中相互作用理论的关联函数的微扰修正经常随时间增长。这种增长可能导致后期微扰理论的崩溃。我们认为,动力学重整化群(DRG)技术提供了一个方便的框架,解释和重现这些长期增长的条款。在德西特的无质量标量场和四次自相互作用的情况下,在红外线上的图解结果也不那么奇异,这与产生动力学质量时所预期的方式完全一样。我们比较这种改进的红外行为与大N扩展时适用。

英文摘要:

Perturbative corrections to correlation functions for interacting theories in de Sitter spacetime often grow secularly with time, due to the properties of fluctuations on super-Hubble scales. This growth can lead to a breakdown of perturbation theory at late times. We argue that Dynamical Renormalization Group (DRG) techniques provide a convenient framework for interpreting and resumming these secularly growing terms. In the case of a massless scalar field in de Sitter with quartic self-interaction, the resummed result is also less singular in the infrared, in precisely the manner expected if a dynamical mass is generated. We compare this improved infrared behavior with large-N expansions when applicable.

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