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arXiv 0705.3837hep-thastro-ph
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一个微妙的宇宙

A Delicate Universe

Daniel Baumann, Anatoly Dymarsky, Igor R. Klebanov, Liam McAllister, Paul J. Steinhardt

摘要:

我们研究了在弦紧化中弯曲D膜膨胀的显式模型是否是可能的。为此,我们研究了潜在的D3膜运动的翘曲锥,其中包括全纯嵌入D 7膜参与模稳定。D 7-膜的存在显著地改变了暴胀子势。我们构造了一个例子,基于一个非常简单的和对称的嵌入由于Kuperstein,z_1 =常数,其中有可能微调的潜力,使缓慢滚动的通货膨胀可以发生。由此产生的模型是相当微妙的:暴胀发生在拐点附近,宇宙学预测对势的精确形状非常敏感。

英文摘要:

We investigate whether explicit models of warped D-brane inflation are possible in string compactifications. To this end, we study the potential for D3-brane motion in a warped conifold that includes holomorphically-embedded D7-branes involved in moduli stabilization. The presence of the D7-branes significantly modifies the inflaton potential. We construct an example based on a very simple and symmetric embedding due to Kuperstein, z_1 = constant, in which it is possible to fine-tune the potential so that slow roll inflation can occur. The resulting model is rather delicate: inflation occurs in the vicinity of an inflection point, and the cosmological predictions are extremely sensitive to the precise shape of the potential.

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