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arXiv 1301.5641astro-ph.CO
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原始宇宙中半经典涨落的极限

Limits on Semiclassical Fluctuations in the Primordial Universe

Grigor Aslanyan, Aneesh V. Manohar, Amit P. S. Yadav

摘要:

我们将限制半经典波动,可能存在于原始扰动谱。如果暴胀前的某些特征在膨胀中幸存下来,或者可以由任何终止暴胀的机制产生,这些特征就会出现。我们研究了两种可能的模型,这样的剩余波动,这两个都打破了大尺度上的CMB的各向同性。我们首先考虑一个原始微扰傅立叶模的半经典涨落。我们分析的第二种情况是空间某处的半经典高斯凸点。这些模型进行了测试与七年的WMAP数据使用马尔可夫链蒙特卡罗贝叶斯分析,我们把这些波动的限制。单个傅里叶模式中波动幅度的上限为a<=10^(-4),而对于高斯凸块,a<=10^(-3)。

英文摘要:

We place limits on semiclassical fluctuations that might be present in the primordial perturbation spectrum. These can arise if some signatures of pre-inflationary features survive the expansion, or could be created by whatever mechanism ends inflation. We study two possible models for such remnant fluctuations, both of which break the isotropy of CMB on large scales. We first consider a semiclassical fluctuation in one Fourier mode of primordial perturbations. The second scenario we analyze is a semiclassical Gaussian bump somewhere in space. These models are tested with the seven-year WMAP data using a Markov Chain Monte Carlo Bayesian analysis, and we place limits on these fluctuations. The upper bound for the amplitude of a fluctuation in a single Fourier mode is a<=10^(-4), while for the Gaussian bump a<=10^(-3).

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