Observational constraints on assisted k-inflation
Observational constraints on assisted k-inflation
复制标题
辅助 k 膨胀的观测限制
DOI：
10.1103/physrevd.83.103522
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发表时间：
2011
影响因子：
5
通讯作者：
Shinji Tsujikawa
中科院分区：
文献类型：
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作者：
Junko Ohashi;Shinji Tsujikawa
我们研究了辅助k-膨胀模型的观测约束，在该模型中，多个标量场加入一个由一个有效场表征的吸引子。这个有效的单场系统由拉格朗日描述，其中的动能是一个常数，是关于的任意函数。我们的分析涵盖了各种各样的k膨胀模型，如膨胀的幽灵凝聚体、狄拉克-伯恩菲尔德场和快子，以及具有指数势的正则场。结合重子声振荡和哈勃常数测量，我们从WMAP的7年数据中给出了每个模型的参数的观测界限。利用等边非高斯参数的观测约束，进一步限制了膨胀幻影凝聚模型和Dirac-Born-Infeld模型所允许的参数空间。我们将这种分析推广到具有几种不同选择的更一般的模型，并表明()这样的模型被标量/张量谱和原始非高斯性的联合数据分析所排除。
We study observational constraints on the assisted k-inflation models in which multiple scalar fields join an attractor characterized by an effective single field. This effective single-field system is described by the Lagrangian, whereis the kinetic energy of,is a constant, andis an arbitrary function in terms of. Our analysis covers a wide variety of k-inflation models such as dilatonic ghost condensate, Dirac-Born-Infeld field, and tachyon, as well as the canonical field with an exponential potential. We place observational bounds on the parameters of each model from the WMAP 7yr data combined with baryon acoustic oscillations and the Hubble constant measurement. Using the observational constraints of the equilateral non-Gaussianity parameter, we further restrict the allowed parameter space of dilatonic ghost condensate and Dirac-Born-Infeld models. We extend the analysis <?format ?>to more general models with several different choices ofand show that the models such as() are excluded by the joint data analysis of the scalar/tensor spectra and primordial non-Gaussianities.