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arXiv 0710.2385astro-ph
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暴胀初始条件对有限慢卷暴胀中功率谱和角功率谱的影响

Effect of initial condition of inflation on power and angular power spectra in finite slow-roll inflation

Shiro Hirai, Tomoyuki Takami

摘要:

在慢卷暴胀模型下,估计了暴胀初始条件对标量和张量扰动功率谱的影响。通过在暴胀中定义一个更一般的初始状态,可以揭示功率谱的特殊性质,如振荡。的功率谱的行为示出相对于有限的膨胀长度的辐射和标量物质占主导地位的预膨胀的情况下,表现出阶梯状的变化。示出的功率谱振荡的辐射为主的情况下。这样的功率谱上的TT和TE功率谱的影响进行检查三个典型的慢滚膨胀模型,一个小的字段模型,一个大的字段模型,和一个混合模型,考虑到两个预膨胀模型。发现WMAP 3数据和Lambda CDM模型之间的差异,例如在l=2处的谱的抑制,可以在一定程度上由接近60 e-折叠的膨胀的有限长度来解释。在所考虑的模型中,具有标量物质主导的预膨胀的小场膨胀模型提供了对WMAP 3数据的最佳拟合。相对较大的变化角TT功率谱发生在响应于小的变化,在膨胀长度的辐射占主导地位的预膨胀模型,和一半的情况下不适合与观测数据。这种行为被认为是归因于功率谱的振荡行为。因此,标量物质占主导地位的情况下,优选的辐射占主导地位的情况下,膨胀前,独立的膨胀的长度。

英文摘要:

The effect of the initial condition of inflation on the power spectra of scalar and tensor perturbations is estimated assuming a slow-roll inflation model. By defining a more general initial state in inflation particular properties of the power spectrum such as oscillation can be revealed. The behavior of the power spectrum is shown to exhibit a step-like variation with respect to finite inflation length in cases of both radiation- and scalar matter-dominated pre-inflation. The power spectrum is shown to oscillate in the radiation-dominated case. The effects of such a power spectrum on the TT and TE power spectra are examined for three typical slow-roll inflation models; a small-field model, a large field model, and a hybrid model, considering both pre-inflation models. It is found that the discrepancies between WMAP3 data and the Lambda CDM model, such as suppression of the spectrum at l=2, may be explained to a certain extent by the finite length of inflation for inflation of close to 60 e-folds. The small-field inflation model with scalar matter-dominated pre-inflation provides the best fit to the WMAP3 data among the models considered. Relatively large changes in the angular TT power spectrum occur in response to small changes in inflation length in the radiation-dominated pre-inflation models, and half cases do not fit well with the observed data. This behavior is considered to be attributable to the oscillatory behavior of the power spectrum. The scalar matter-dominated case is thus preferred to the radiation-dominated case of pre-inflation, independent of the length of inflation.

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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