CMB Fluctuations and String Compactification Scales
CMB Fluctuations and String Compactification Scales
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CMB 波动和弦压实尺度
DOI：
10.1016/j.physletb.2011.12.018
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Masao Ninomiya and Yasuhiro Sekino
中科院分区：
文献类型：
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作者：
Yoshinobu Habara;Hikaru Kawai;Masao Ninomiya and Yasuhiro Sekino
我们提出了宇宙微波背景辐射温度涨落产生的一种机制。我们考虑了大量的领域，如卡鲁扎-克莱因模式和字符串激发。每个场对引力势的贡献都很小，但通过将通常为1014阶场的贡献相加，可以获得可观察到的温度波动水平。张量涨落几乎不受这些场的影响。我们的机制是基于经典静止场的纯量子效应，与慢卷暴胀中的机制不同。使用观测数据，我们发现这个模型的参数，如额外维度的大小和字符串规模的限制。我们的模型预测了一个特定的模式，非高斯与一个小的幅度。
We propose a mechanism for the generation of temperature fluctuations of cosmic microwave background. We consider a large number of fields, such as Kaluza–Klein modes and string excitations. Each field contributes to the gravitational potential by a small amount, but an observable level of temperature fluctuations is achieved by summing up the contribution of typically of order 1014fields. Tensor fluctuations are hardly affected by these fields. Our mechanism is based on purely quantum effects of the fields which are classically at rest, and is different from the one in slow-roll inflation. Using the observed data, we find constraints on the parameters of this model, such as the size of the extra dimensions and the string scale. Our model predicts a particular pattern of non-gaussianity with a small magnitude.