arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.05830hep-thastro-ph.COgr-qc
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纤维膨胀与$α$ -吸引子

Fibre Inflation and $α$-attractors

Renata Kallosh, Andrei Linde, Diederik Roest, Alexander Westphal, Yusuke Yamada

摘要:

纤维暴胀是一种特殊的弦论构造,它基于产生暴胀平台的大体积方案。我们概述了它的关系$α$吸引模型的通货膨胀,宇宙学部门起源于某些弦论的修正导致$α=2$和$α=1/2$。在一定的场范围以上,高阶修正的陡化效应首先导致单场慢滚的崩溃,然后导致2场动力学的开始:额外维度的总体积开始参与有效动力学。最后,我们提出了有效的超重力纤维膨胀模型的基础上${\overline {D3}}$隆起项与幂零超场。特定的模量依赖于$\overline {D3}$诱导的几何形状导致宇宙学纤维模型,但除了一个德西特最小出口。这些由纤维暴胀激发的超引力模型相对简单,稳定了轴子,并将哈勃参数从超对称性破缺中解脱出来。

英文摘要:

Fibre inflation is a specific string theory construction based on the Large Volume Scenario that produces an inflationary plateau. We outline its relation to $α$-attractor models for inflation, with the cosmological sector originating from certain string theory corrections leading to $α=2$ and $α=1/2$. Above a certain field range, the steepening effect of higher-order corrections leads first to the breakdown of single-field slow-roll and after that to the onset of 2-field dynamics: the overall volume of the extra dimensions starts to participate in the effective dynamics. Finally, we propose effective supergravity models of fibre inflation based on an ${\overline {D3}}$ uplift term with a nilpotent superfield. Specific moduli dependent $\overline {D3}$ induced geometries lead to cosmological fibre models but have in addition a de Sitter minimum exit. These supergravity models motivated by fibre inflation are relatively simple, stabilize the axions and disentangle the Hubble parameter from supersymmetry breaking.

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