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arXiv 0901.0267hep-th
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开放赛道上的通货膨胀

Inflation on an Open Racetrack

Heng-Yu Chen, Ling-Yan Hung, Gary Shiu

摘要:

我们提出了一个变形的翘曲D-膜膨胀,将多套全纯嵌入的D 7膜参与模稳定与范围到一个翘曲的喉咙。D3-膜的运动取决于D 7-膜的构型和D3-膜在这些背景中的相对位置。非微扰模稳定化超势采用跑道形式,但额外的D3膜开弦模依赖性提供了更多的灵活性,在模型的建立。具体地说,我们考虑了在多个D 7-膜存在的情况下翘曲变形锥中的D3-膜运动,并导出了对整个喉道有效的标量势。通过对微物理参数的显式调整,我们得到了各种D 7膜结构在拐点附近的暴胀轨迹。此外,开放的赛道潜力承认上升前近似闵可夫斯基真空。我们证明了一个具体的D膜膨胀模型,在膨胀过程中的哈勃尺度可以超过引力子质量。最后,在这个开放的跑道结构中存在的多组D 7-膜也提供了一种机制,使D3-膜稳定在翘曲喉道的中间区域的亚稳真空。

英文摘要:

We present a variant of warped D-brane inflation by incorporating multiple sets of holomorphically-embedded D7-branes involved in moduli stabilization with extent into a warped throat. The resultant D3-brane motion depends on the D7-brane configuration and the relative position of the D3-brane in these backgrounds. The non-perturbative moduli stabilization superpotential takes the racetrack form, but the additional D3-brane open string moduli dependence provides more flexibilities in model building. For concreteness, we consider D3-brane motion in the warped deformed conifold with the presence of multiple D7-branes, and derive the scalar potential valid for the entire throat. By explicit tuning of the microphysical parameters, we obtain inflationary trajectories near an inflection point for various D7-brane configurations. Moreover, the open racetrack potential admits approximate Minkowski vacua before uplifting. We demonstrate with a concrete D-brane inflation model where the Hubble scale during inflation can exceed the gravitino mass. Finally, the multiple sets of D7-branes present in this open racetrack setup also provides a mechanism to stabilize the D3-brane to metastable vacua in the intermediate region of the warped throat.

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