Running Spectral Index from Inflation with Modulations
Running Spectral Index from Inflation with Modulations
复制标题
DOI：
10.1088/1475-7516/2011/01/026
复制
发表时间：
2010-11
影响因子：
6.4
通讯作者：
Takeshi Kobayashi;F. Takahashi
中科院分区：
文献类型：
--
作者：
Takeshi Kobayashi;F. Takahashi
我们认为，一个大的负运行谱指数，如果得到证实，可能表明在暴胀潜力中存在丰富的结构，这导致光谱指数在所有尺度上都有相当大的（正负）运行。结果表明，最近的宇宙微波背景数据显示的运行谱指数的中心值可以很容易地用叠加周期振荡的暴胀势来解释。与恒定运行的情况相比，由于重复调制，在小尺度上扰动谱增强。我们提到，这些特征在小尺度上可能会在未来的21厘米观测中看到。
We argue that a large negative running spectral index, if confirmed, might suggest that there are abundant structures in the inflaton potential, which result in a fairly large (both positive and negative) running of the spectral index at all scales. It is shown that the center value of the running spectral index suggested by the recent CMB data can be easily explained by an inflaton potential with superimposed periodic oscillations. In contrast to cases with constant running, the perturbation spectrum is enhanced at small scales, due to the repeated modulations. We mention that such features at small scales may be seen by 21 cm observations in the future.