Anisotropic Non-Gaussianity from a Two-Form Field
Anisotropic Non-Gaussianity from a Two-Form Field
复制标题
二元场的各向异性非高斯性
DOI：
10.1103/physrevd.87.083520
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J.Soda and S.Tsujikawa
中科院分区：
文献类型：
--
作者：
J.Ohashi;J.Soda and S.Tsujikawa
我们研究了一个暴胀的情况下，一个暴胀子夫妇nontrivially两种形式的领域。首先，我们证明了各向异性膨胀可以实现为吸引子解决方案，并在膨胀过程中保持两种形式的头发。统计各向异性可以发展，因为累积的各向异性相互作用诱导的背景两种形式的字段。曲率扰动的功率谱具有扁长型各向异性，与具有扁长型各向异性的矢量模型相反。我们还评估了双谱和三谱的曲率扰动，采用在形式主义的基础上相互作用的哈密顿。我们发现非线性估计量和与功率谱中统计各向异性的幅度相关。与矢量模型不同，在压缩极限下，和都消失了。但在等边极限和包络极限下，估计量可达10阶。这些结果与最新的约束边界一致<?format ?>普朗克。
We study an inflationary scenario with a two-form field to which an inflaton couples nontrivially. First, we show that anisotropic inflation can be realized as an attractor solution and that the two-form hair remains during inflation. A statistical anisotropy can be developed because of a cumulative anisotropic interaction induced by the background two-form field. The power spectrum of curvature perturbations has a prolate-type anisotropy, in contrast to the vector models having an oblate-type anisotropy. We also evaluate the bispectrum and trispectrum of curvature perturbations by employing the in-in formalism based on the interacting Hamiltonians. We find that the nonlinear estimatorsandare correlated with the amplitudeof the statistical anisotropy in the power spectrum. Unlike the vector models, bothandvanish in the squeezed limit. However, the estimatorcan reach the order of 10 in the equilateral and enfolded limits. These results are consistent with the latest bounds onconstrained <?format ?>by Planck.