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arXiv 1302.3544astro-ph.COgr-qchep-phhep-th
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具有量子噪声和热噪声的暴胀模型的功率谱

Power spectrum for inflation models with quantum and thermal noises

Rudnei O. Ramos, L. A. da Silva

摘要:

我们确定的功率谱的通货膨胀模型涵盖所有制度,从冷(等熵)到温暖(非等熵)的通货膨胀。我们在随机通货膨胀方法的背景下工作,它可以很好地描述这两种类型的通货膨胀制度伴随。通过分析,以确定允许的参数空间简单的单场多项式混沌暴胀模型是一致的,从9年威尔金森微波各向异性探测器(WMAP)的最新宇宙学数据,并结合其他观测宇宙学来源。我们提出的结果的振幅的功率谱,谱指数和张量标量曲率扰动振幅比。我们简要地讨论了运行时的情况。尽管单场多项式型暴胀子势模型在冷暴胀情况下很不受欢迎,甚至在它们最简单的版本中已经被排除,但对于一般的非等熵暴胀模型,情况并非如此(特别是热膨胀),尽管高阶多项式势(高于四次阶)在这种情况下也倾向于变得不那么有利,呈现出与最近观测到的宇宙学数据兼容的参数空间的小得多的区域。我们的发现在最近公布的普朗克结果面前仍然有效。

英文摘要:

We determine the power spectrum for inflation models covering all regimes from cold (isentropic) to warm (nonisentropic) inflation. We work in the context of the stochastic inflation approach, which can nicely describe both types of inflationary regimes concomitantly. A throughout analysis is carried out to determine the allowed parameter space for simple single field polynomial chaotic inflation models that is consistent with the most recent cosmological data from the nine-year Wilkinson Microwave Anisotropy Probe (WMAP) and in conjunction with other observational cosmological sources. We present the results for both the amplitude of the power spectrum, the spectral index and for the tensor to scalar curvature perturbation amplitude ratio. We briefly discuss cases when running is present. Despite single field polynomial-type inflaton potential models be strongly disfavored, or even be already ruled out in their simplest versions in the case of cold inflation, this is not the case for nonisentropic inflation models in general (warm inflation in particular), though higher order polynomial potentials (higher than quartic order) tend to become less favorable also in this case, presenting a much smaller region of parameter space compatible with the recent observational cosmological data. Our findings also remain valid in face of the recently released Planck results.

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