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arXiv 0709.0293hep-thastro-phhep-ph
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暴胀的有效场论

The Effective Field Theory of Inflation

Clifford Cheung, Paolo Creminelli, A. Liam Fitzpatrick, Jared Kaplan, Leonardo Senatore

摘要:

我们研究了暴胀的有效场论,即在单场模型下描述准de Sitter背景周围涨落的最一般理论。标量模可以通过幺正规范而被度规吃掉。在这个规范中,最一般的理论是建立在空间非同态下不变的最低维算子,如g^{00}和K_{mu nu},常数时间曲面的外曲率。这种方法使我们能够描述所有可能的高能量修正简单的慢卷膨胀,其大小受到实验的限制。此外,它描述了在一个共同的语言所有单场模型,包括那些与一个小的声速和幽灵膨胀,它明确的含义,有一个准德西特背景。时间同态的非线性实现迫使不同观测量之间的相关性,如降低的声速和增强的非高斯性水平。

英文摘要:

We study the effective field theory of inflation, i.e. the most general theory describing the fluctuations around a quasi de Sitter background, in the case of single field models. The scalar mode can be eaten by the metric by going to unitary gauge. In this gauge, the most general theory is built with the lowest dimension operators invariant under spatial diffeomorphisms, like g^{00} and K_{mu nu}, the extrinsic curvature of constant time surfaces. This approach allows us to characterize all the possible high energy corrections to simple slow-roll inflation, whose sizes are constrained by experiments. Also, it describes in a common language all single field models, including those with a small speed of sound and Ghost Inflation, and it makes explicit the implications of having a quasi de Sitter background. The non-linear realization of time diffeomorphisms forces correlation among different observables, like a reduced speed of sound and an enhanced level of non-Gaussianity.

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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