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arXiv 1204.6489astro-ph.COgr-qchep-th
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Starobinsky暴胀模型中的强尺度相关双谱

Strong scale dependent bispectrum in the Starobinsky model of inflation

Frederico Arroja, Misao Sasaki

摘要:

我们计算解析的占主导地位的贡献树级双谱的Starobinsky模型的通货膨胀。在这个模型中,势是真空能主导的,但包含一个次主导的线性项,它在一个点处突然改变斜率。我们表明,在大尺度上相比,过渡尺度$k_0$和在等边限制的模拟的非线性参数尺度为$(k/k_0)^2$,这是它的幅度衰减越来越大的尺度,直到它成为次显性相对于通常的慢滚抑制校正。在小尺度上,我们表明,非线性参数振荡的角频率由$3/k_0$和它的幅度线性增长,朝着更小的尺度,可以是大的依赖于模型参数。我们还比较了我们的结果与文献中以前的结果。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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