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arXiv 0805.1998gr-qcastro-phhep-th
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随机膨胀与降维

Stochastic Inflation and Dimensional Reduction

Florian Kuhnel, Dominik J. Schwarz

摘要:

我们提出了一个随机暴胀的副本场论方法,其中发现了降维的表现形式,后者占主导地位的尺度随时间呈指数快速增长,从而影响最大的超视界尺度。我们发现,在这些尺度上的光谱指数不可避免的修改。发现了噪声相关器与非高斯参数f_NL之间的显式关系。

英文摘要:

We present a replica field-theoretic approach to stochastic inflation in which a manifestation of dimensional reduction is found. The scale above which the latter dominates grows exponentially fast with time and thus affects largest super-horizon scales. We find inevitable modifications of the spectral index on those scales. An explicit relation between the noise correlator and the non-gaussianity parameter f_NL is found.

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