Strong scale dependent bispectrum in the Starobinsky model of inflation
Strong scale dependent bispectrum in the Starobinsky model of inflation
复制标题
Starobinsky 通货膨胀模型中的强尺度依赖双谱
DOI：
10.1088/1475-7516/2012/08/012
复制
发表时间：
2012
影响因子：
6.4
通讯作者：
Misao Sasaki
中科院分区：
文献类型：
--
作者：
Frederico Arroja;Misao Sasaki
We compute analytically the dominant contribution to the tree-level bispectrum in the Starobinsky model of inflation. In this model, the potential is vacuum energy dominated but contains a subdominant linear term which changes the slope abruptly at a point. We show that on large scales compared with the transition scale k 0 and in the equilateral limit the analogue of the non-linearity parameter scales as (k/k 0) 2, that is its amplitude decays for larger and larger scales until it becomes subdominant with respect to the usual slow-roll suppressed corrections. On small scales we show that the non-linearity parameter oscillates with angular frequency given by 3/k 0 and its amplitude grows linearly towards smaller scales and can be large depending on the model parameters. We also compare our results with previous results in the literature.
