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arXiv 1606.08784hep-thgr-qc
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引力的非定域红外修正。的审查

Nonlocal Infrared Modifications of Gravity. A Review

Michele Maggiore

摘要:

我们回顾了我们小组在过去几年中开发的一种方法,其中GR在红外线中被修改,在有效的水平上,由与质量尺度相关的非局部项。我们首先回顾量子有效作用量的概念及其相关的非定域性,说明它们的一些功能与异常诱导的有效作用量在$D=2$和$D=4$。我们研究非局部理论的概念问题,如因果关系,自由度和鬼魂,强调这些nonlocalities只出现在有效的水平的事实的重要性。我们讨论了一类特殊的非局部理论,其中的非局部算子与质量尺度相关,我们表明,它们在与宇宙学观测的比较中表现得非常好,在某种程度上,它们适合CMB,超新星,BAO和结构形成数据的水平完全竞争$Λ$ CDM,具有相同数量的自由参数。我们探索这些“最小”模型的一些扩展,我们最后讨论了一些方向的调查得出所需的有效的非局部性从一个基本的本地QFT。

英文摘要:

We review an approach developed in the last few years by our group in which GR is modified in the infrared, at an effective level, by nonlocal terms associated to a mass scale. We begin by recalling the notion of quantum effective action and its associated nonlocalities, illustrating some of their features with the anomaly-induced effective actions in $D=2$ and $D=4$. We examine conceptual issues of nonlocal theories such as causality, degrees of freedoms and ghosts, stressing the importance of the fact that these nonlocalities only emerge at the effective level. We discuss a particular class of nonlocal theories where the nonlocal operator is associated to a mass scale, and we show that they perform very well in the comparison with cosmological observations, to the extent that they fit CMB, supernovae, BAO and structure formation data at a level fully competitive with $Λ$CDM, with the same number of free parameters. We explore some extensions of these `minimal' models, and we finally discuss some directions of investigation for deriving the required effective nonlocality from a fundamental local QFT.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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