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arXiv 0704.2095astro-ph
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暴胀前辐射主导期对CMB各向异性的影响

Effects of a pre-inflation radiation-dominated epoch to CMB anisotropy

I-Chin Wang, Kin-Wang Ng

摘要:

我们认为,前暴胀时代是辐射主导的,平稳过渡到暴胀时代。我们详细地计算了暴胀子在相变中的涨落动力学和初始真空态的选择。发现这种相变可以抑制暴胀子的长波长量子涨落。这可能归因于大尺度CMB各向异性,其功率低于标准$Λ$ CDM模型中预测的功率。在约束这种过渡效应的WMAP各向异性数据,我们使用的WMAP最佳拟合尺度不变的$Λ$ CDM模型的密度功率谱取代在这项工作中发现的。我们发现,过渡发生至少约10 e-倍的共动尺度之前,我们目前的视界大小交叉的哈勃半径在通货膨胀。

英文摘要:

We consider that the pre-inflation era is radiation-dominated, transiting smoothly to the inflationary era. We work out in detail the dynamics of inflaton fluctuations across the phase transition and the proper choices of initial vacuum states. It is found that this phase transition can suppress long-wavelength quantum fluctuations of inflaton. This may attribute to the large-scale CMB anisotropy a lower power than predicted in the standard $Λ$CDM model. In constraining this transitional effect by WMAP anisotropy data, we use the WMAP best-fit scale-invariant $Λ$CDM model with the density power spectrum replaced by the one found in this work. We find that the transition occurs at least about 10 e-folds before the comoving scales comparable to our present horizon size cross the Hubble radius during inflation.

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