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arXiv 0902.2934hep-phastro-ph.COhep-th
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具有移位对称性的SUGRA混合暴胀

SUGRA Hybrid Inflation with Shift Symmetry

Stefan Antusch, Koushik Dutta, Philipp M. Kostka

摘要:

我们提出了一个解决超重力(SUGRA)混合暴胀中的eta问题的方法,在一类新的模型中使用Nambu-Goldstone样的移位对称性。树级暴胀子势的平坦性由Kaehler势的移位对称不变性保证,而超势中的小对称破缺项引起回路级的势的斜率。在所提出的类的通货膨胀模型,潜在的危险之间的耦合inflaton和模部门被避免。我们还讨论了在什么条件下,预测的谱指数能与最新WMAP观测的最佳拟合值n_s ~ 0.96相一致,对应于环圈水平的山顶型暴胀子势。

英文摘要:

We propose a solution to the eta-problem in supergravity (SUGRA) hybrid inflation using a Nambu-Goldstone-like shift symmetry within a new class of models. The flatness of the tree-level inflaton potential is ensured by shift symmetry invariance of the Kaehler potential, while a small symmetry breaking term in the superpotential gives rise to a slope of the potential at loop-level. In the proposed class of inflation models, potentially dangerous couplings between the inflaton and the moduli sector are avoided. We also discuss under which conditions the predicted spectral index can be in agreement with the best-fit-value of the latest WMAP observation n_s ~ 0.96, corresponding to a hilltop-type inflaton potential at loop-level.

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