Cosmic variance in inflation with two light scalars
Cosmic variance in inflation with two light scalars
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两个光标量的膨胀的宇宙方差
DOI：
10.1088/1475-7516/2016/05/018
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发表时间：
2015
影响因子：
6.4
通讯作者：
S. Shandera
中科院分区：
文献类型：
--
作者：
B. Bonga;Suddhasattwa Brahma;A. Deutsch;S. Shandera
当具有任意非导数自相互作用的光标量与暴胀子耦合时，我们检查双谱的压缩极限。我们发现，当隐藏扇区标量足够轻时（m≲0.1H），来自一系列高阶相关函数（来自任意阶接触图）的长波长模式和短波长模式之间的耦合导致子体积中波动的统计数据发生变化。这意味着对原初非高斯性的观察不能用于唯一地重建隐藏场的势。然而，由这些图的模式耦合引起的局部双谱总是具有相同的压缩极限，因此场的局部确定质量不受这种宇宙方差的影响。
We examine the squeezed limit of the bispectrum when a light scalar with arbitrary non-derivative self-interactions is coupled to the inflaton. We find that when the hidden sector scalar is sufficiently light (m ≲ 0.1 H), the coupling between long and short wavelength modes from the series of higher order correlation functions (from arbitrary order contact diagrams) causes the statistics of the fluctuations to vary in sub-volumes. This means that observations of primordial non-Gaussianity cannot be used to uniquely reconstruct the potential of the hidden field. However, the local bispectrum induced by mode-coupling from these diagrams always has the same squeezed limit, so the field's locally determined mass is not affected by this cosmic variance.
DOI：
10.1209/0295-5075/103/19001
发表时间：
2013-06
期刊：
Europhysics Letters
影响因子：
--
作者：
C. Byrnes;Sami Nurmi;G. Tasinato;D. Wands
通讯作者：
C. Byrnes;Sami Nurmi;G. Tasinato;D. Wands
影响因子：
6.5
作者：
Ade, P. A. R.;Aghanim, N.;Zonca, A.
通讯作者：
Zonca, A.