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arXiv 0908.0585astro-ph.CO
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在慢滚暴胀中用数值方法确定的曲率扰动功率谱的尺度依赖性

Scale dependence of the power spectrum of the curvature perturbation determined using a numerical method in slow-roll inflation

Shiro Hirai, Tomoyuki Takami

摘要:

泰勒展开方法已被用来研究曲率扰动的功率谱的尺度依赖性。在本研究中,另一种数值方法是用来澄清的$k$的依赖。虽然人们认为这两种方法之间没有很大的区别,但各种通货膨胀模型之间存在一些差异。例如,在$k$ = 1Mpc时,功率谱中存在1.4%的差异,并且相对于角功率谱,在新的暴胀中出现接近10的$χ^2$值的差异。然而,在混合通货膨胀中,这些差异不会发生。研究了暴胀和宇宙学参数的时间依赖性,澄清了暴胀模型之间的差异。

英文摘要:

The Taylor expansion method has been used to investigate the scale dependence of the power spectrum of the curvature perturbation. In the present study, an alternative numerical method is used to clarify the $k$ dependence. Although there is thought to be no large difference between these two methods, some differences arise among various inflation models. For example, at $k$ = 1 Mpc, there is a 1.4 % difference in the power spectrum, and with respect to the angular power spectrum, the difference of the value of $χ^2$ nearly 10 occur in new inflation. However, in hybrid inflation, these differences do not occur. The time dependence of the inflationary and cosmological parameters is investigated, and differences among inflation models are clarified.

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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