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arXiv 1404.7855hep-thastro-ph.COhep-ph
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自然SUSY混合模型中BICEP2的大张量谱

Large tensor spectrum of BICEP2 in the natural SUSY hybrid model

Ki-Young Choi, Bumseok Kyae

备注：
14 pages, 2 eps figures, version to appear in Phys. Rev. D
发表信息：
Phys. Rev. D 90, 023536 (2014)
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摘要：

最近由BICEP 2合作观测到的大张量谱要求在单场暴胀情况下暴胀子的超普朗克场变化。慢滚参数ε \approx 0.01的要求将使（次）普朗克暴胀模型中的e折叠数限制在7左右。为了克服这些问题，我们考虑了一个基于自然辅助超对称（SUSY）混合模型（“自然SUSY混合暴胀”[1]）的双场场景，该模型结合了SUSY混合模型和自然暴胀模型。来自自然暴胀区的轴子暴胀子场可以接受张量谱的正确值以及0.96的谱指数，其衰减常数小于普朗克尺度f \lesssim M_P。另一方面，来自超对称混合区的暴胀子提供了2 x 10^{16} GeV的真空能量和50个e折叠，避免了eta问题。通过引入U（1）_R和位移对称性，并采用最小Kahler势，得到了这两种方法。

英文摘要：

The large tensor spectrum recently observed by the BICEP2 Collaboration requires a super-Planckian field variation of the inflaton in the single-field inflationary scenario. The required slow-roll parameter ε\approx 0.01 would restrict the e-folding number to around 7 in (sub-)Planckian inflationary models. To overcome such problems, we consider a two-field scenario based on the natural assisted supersymmetric (SUSY) hybrid model ("natural SUSY hybrid inflation" [1]), which combines the SUSY hybrid and the natural inflation models. The axionic inflaton field from the natural inflation sector can admit the right values for the tensor spectrum as well as a spectral index of 0.96 with a decay constant smaller than the Planck scale, f \lesssim M_P. On the other hand, the vacuum energy of 2 x 10^{16} GeV with 50 e-folds is provided by the inflaton coming from the SUSY hybrid sector, avoiding the eta problem. These are achieved by introducing both the U(1)_R and a shift symmetry, and employing the minimal Kahler potential.

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