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arXiv 1601.07557astro-ph.COhep-ph
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普朗克2015年后的暗辐射和暴胀自由

Dark Radiation and Inflationary Freedom after Planck 2015

Eleonora Di Valentino, Stefano Gariazzo, Martina Gerbino, Elena Giusarma, Olga Mena

摘要:

最简单的暴胀模型预测了曲率涨落的原始功率谱(PPS),它可以用一个近似尺度不变的幂律函数来描述。然而,已经表明,CMB各向异性的低多极谱可能暗示标量PPS形状中存在一些特征,这些特征可能偏离其正则幂律形式。我们用中微子各向异性、中微子质量、相对论性粒子的有效数和一个无菌中微子或一个热轴子质量研究了这种非标准PPS的可能简并性。当在数据分析中仅包括温度自相关谱测量时,在具有非标准PPS的模型中,对这些附加参数的限制较少。偏振光谱的包含显着有助于减少简并性,导致结果通常显示与具有标准幂律PPS的$Λ$ CDM模型没有偏差。

英文摘要:

The simplest inflationary models predict a primordial power spectrum (PPS) of the curvature fluctuations that can be described by a power-law function that is nearly scale-invariant. It has been shown, however, that the low-multipole spectrum of the CMB anisotropies may hint the presence of some features in the shape of the scalar PPS, which could deviate from its canonical power-law form. We study the possible degeneracies of this non-standard PPS with the neutrino anisotropies, the neutrino masses, the effective number of relativistic species and a sterile neutrino or a thermal axion mass. The limits on these additional parameters are less constraining in a model with a non-standard PPS when only including the temperature auto-correlation spectrum measurements in the data analyses. The inclusion of the polarization spectra noticeably helps in reducing the degeneracies, leading to results that typically show no deviation from the $Λ$CDM model with a standard power-law PPS.

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