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arXiv 0705.3786hep-phastro-ph
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新平稳混合通胀

New smooth hybrid inflation

G. Lazarides, A. Vamvasakis

摘要:

我们考虑了超对称Pati-Salam模型的推广,它解决了具有精确Yukawa统一和普适边界条件的超对称大统一模型的b夸克质量问题,并导致了所谓的新移动混合暴胀方案.我们发现,这个模型也可以导致一个新版本的光滑的混合通货膨胀的基础上,只重正化的相互作用提供了一个特定的参数,其超势是有点小。该势具有经典倾斜的极小谷,可作为暴胀路径。该模型与采用标准幂律宇宙学模型对Wilkinson微波各向异性探测器三年观测数据的拟合结果一致,该模型包含冷暗物质和一个宇宙学常数。特别是,光谱指数原来是足够小,使其与数据兼容。此外,Pati-Salam规范群在暴胀过程中被破坏为标准模型规范群,因此,在暴胀结束时没有形成单极子。基于非最小Kaehler势的超引力修正,通过方便地选择符号,使谱指数保持在允许的范围内,而不会在暴胀路径上产生极大值和极小值,从而避免了对暴胀初始条件的不自然限制。

英文摘要:

We consider the extension of the supersymmetric Pati-Salam model which solves the b-quark mass problem of supersymmetric grand unified models with exact Yukawa unification and universal boundary conditions and leads to the so-called new shifted hybrid inflationary scenario. We show that this model can also lead to a new version of smooth hybrid inflation based only on renormalizable interactions provided that a particular parameter of its superpotential is somewhat small. The potential possesses valleys of minima with classical inclination, which can be used as inflationary paths. The model is consistent with the fitting of the three-year Wilkinson microwave anisotropy probe data by the standard power-law cosmological model with cold dark matter and a cosmological constant. In particular, the spectral index turns out to be adequately small so that it is compatible with the data. Moreover, the Pati-Salam gauge group is broken to the standard model gauge group during inflation and, thus, no monopoles are formed at the end of inflation. Supergravity corrections based on a non-minimal Kaehler potential with a convenient choice of a sign keep the spectral index comfortably within the allowed range without generating maxima and minima of the potential on the inflationary path. So, unnatural restrictions on the initial conditions for inflation can be avoided.

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