Towards an explicit model of D-brane inflation
Towards an explicit model of D-brane inflation
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DOI：
10.1088/1475-7516/2008/01/024
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发表时间：
2007-06
影响因子：
6.4
通讯作者：
D. Baumann;A. Dymarsky;I. Klebanov;L. McAllister
中科院分区：
文献类型：
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作者：
D. Baumann;A. Dymarsky;I. Klebanov;L. McAllister
我们提出了一个详细的分析扭曲的D-膜膨胀的显式模型，将模量稳定的影响。我们认为潜在的D3膜运动在一个扭曲的conifold背景，包括通量和全纯嵌入D 7膜参与模稳定。虽然D 7-膜显著地修正了暴胀子势，但它们并没有修正势中的二次项，因此不会导致慢滚参数eta的均匀变化。然而，我们给出了一个简单的例子，基于D 7-膜的Kuperstein嵌入，z1 =常数，其中的势可以被微调到足够平坦的暴胀。为了得到这个结果，必须考虑紧化体积随D3-膜移动而轻微变化的事实。我们强调，紧化几何决定了暴胀子拉格朗日量中参数之间的某些关系，而这些微观约束对可能模型的空间施加了严格的限制。我们注意到，最终暴胀子势的形状与早期研究中给出的预测不同：在暴胀发生的配置中，它在拐点附近发生。最后，我们评论在这种情况下，精确的宇宙学预测的困难。这是Baumann等人（2007 Phys. Rev. Lett. 99 141601）。
We present a detailed analysis of an explicit model of warped D-brane inflation, incorporating the effects of moduli stabilization. We consider the potential for D3-brane motion in a warped conifold background that includes fluxes and holomorphically embedded D7-branes involved in moduli stabilization. Although the D7-branes significantly modify the inflaton potential, they do not correct the quadratic term in the potential, and hence do not cause a uniform change in the slow roll parameter eta. Nevertheless, we present a simple example based on the Kuperstein embedding of D7-branes, z1 = constant, in which the potential can be fine-tuned to be sufficiently flat for inflation. To derive this result, it is essential to incorporate the fact that the compactification volume changes slightly as the D3-brane moves. We stress that the compactification geometry dictates certain relationships among the parameters in the inflaton Lagrangian, and these microscopic constraints impose severe restrictions on the space of possible models. We note that the shape of the final inflaton potential differs from projections given in earlier studies: in configurations where inflation occurs, it does so near an inflection point. Finally, we comment on the difficulty of making precise cosmological predictions in this scenario. This is the companion paper to Baumann et al (2007 Phys. Rev. Lett. 99 141601).