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arXiv 0802.0491hep-thastro-phhep-ph
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膜膨胀中的对偶级联

Duality Cascade in Brane Inflation

Rachel Bean, Xingang Chen, Girma Hailu, S. -H. Henry Tye, Jiajun Xu

备注：
Corrections in Eq.(5.47), Eq (5.48), Eq(5.49) and Fig 4
发表信息：
JCAP 0803:026,2008
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摘要：

我们表明，膜膨胀是非常敏感的微小的尖锐的功能，在额外的维度，包括那些在潜在的和扭曲的因素。这可以表现为宇宙微波背景辐射（CMBR）的功率谱和/或非高斯性的观测特征。这种尖锐特征的一个一般例子是在弯曲的喉道中的一系列小台阶，这是由Seiberg对偶级联使用规范/引力对偶引起的。我们研究了膜膨胀中这些步骤的宇宙学观测结果。由于这些步骤是一系列的，因此可以通过未来的数据和分析来测试其他步骤及其属性的预测。也有可能这些阶跃太接近而不能在功率谱中分辨，在这种情况下，它们可能仅在CMB温度波动和/或EE偏振的非高斯性中显示。我们研究两个案例。在慢卷的情况下，台阶出现在暴胀子势，膜膨胀的高度和宽度的台阶的敏感性增加了几个数量级相比，在以前研究的大场模型。在红外DBI的情况下，步骤中出现的翘曲因子，我们发现，这些尖锐的功能所造成的功率谱中的毛刺一般很小，甚至无法观察到，但相关的独特的非高斯性可以很大。再加上它的功率谱指数的大负值，这个情景清楚地说明了膜暴胀情景与一般的慢卷暴胀相比是多么丰富和不同。这种独特的弦特征可能为超弦理论提供了一个强有力的探索。

英文摘要：

We show that brane inflation is very sensitive to tiny sharp features in extra dimensions, including those in the potential and in the warp factor. This can show up as observational signatures in the power spectrum and/or non-Gaussianities of the cosmic microwave background radiation (CMBR). One general example of such sharp features is a succession of small steps in a warped throat, caused by Seiberg duality cascade using gauge/gravity duality. We study the cosmological observational consequences of these steps in brane inflation. Since the steps come in a series, the prediction of other steps and their properties can be tested by future data and analysis. It is also possible that the steps are too close to be resolved in the power spectrum, in which case they may show up only in the non-Gaussianity of the CMB temperature fluctuations and/or EE polarization. We study two cases. In the slow-roll scenario where steps appear in the inflaton potential, the sensitivity of brane inflation to the height and width of the steps is increased by several orders of magnitude comparing to that in previously studied large field models. In the IR DBI scenario where steps appear in the warp factor, we find that the glitches in the power spectrum caused by these sharp features are generally small or even unobservable, but associated distinctive non-Gaussianity can be large. Together with its large negative running of the power spectrum index, this scenario clearly illustrates how rich and different a brane inflationary scenario can be when compared to generic slow-roll inflation. Such distinctive stringy features may provide a powerful probe of superstring theory.

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