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arXiv 0912.0791hep-thastro-ph.COgr-qchep-ph
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在弯曲喉道中旋转弯曲膜

Rotating a Curvaton Brane in a Warped Throat

Jun Zhang, Yi-Fu Cai, Yun-Song Piao

摘要:

本文研究了一个曲率模型,该模型是通过考虑一个在近似等距的KS喉道底部作角运动的探针反D3-膜而得到的。我们计算了该模型的曲率扰动谱和非高斯性。具体地说,我们考虑了曲率膜的相对论旋转的极限,这导致了一个小的声速,因此它可以被看作是一个实现的DBI曲率机制。我们发现,原始功率谱几乎是标度不变的,而局部型的非高斯性是相当大的,等边型的非高斯性通常是大的和负的。此外,我们研究了该模型的理论和观测约束,发现该模型的相空间存在一个相当大的允许区域。

英文摘要:

In this paper we study a curvaton model obtained by considering a probe anti-D3-brane with angular motion at the bottom of a KS throat with approximate isometries. We calculate the spectrum of curvature perturbations and the non-Gaussianities of this model. Specifically, we consider the limit of relativistic rotation of the curvaton brane which leads to a small sound speed, and thus it can be viewed as an implementation of the DBI-curvaton mechanism. We find that the primordial power spectrum is nearly scale-invariant while the non-Gaussianity of local type is sizable and that of equilateral type is usually large and negative. Moreover, we study both the theoretical and observational constraints on this model, and find that there exists a sizable allowed region for the phase space of this model.

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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