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arXiv 1606.03057astro-ph.COhep-ph
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测试新物理学：中微子和原始功率谱

Testing for New Physics: Neutrinos and the Primordial Power Spectrum

Nicolas Canac, Grigor Aslanyan, Kevork N. Abazajian, Richard Easther, Layne C. Price

备注：
23 pages, 9 figures, 8 tables; matches version published in JCAP
发表信息：
JCAP09(2016)022
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摘要：

我们测试的灵敏度中微子参数约束的CMB和LSS数据集的组合，以假设的形式的原始功率谱（PPS）使用贝叶斯模型选择。值得注意的是，没有一个测试的组合，包括最近对$\mathrm{H}_0$和星团丰度的高精度局部测量，表明有大质量中微子或额外相对论自由度的信号。对于具有大的但固定数量的自由度的PPS模型，如果PPS中的任何特征的位置被允许变化，则中微子参数约束不会显著改变，尽管中微子约束对PPS特征更敏感，如果它们先验地已知以固定间隔存在于$\log k$中。虽然中微子质量和相对论能量密度的约束都不支持非标准中微子扇区，但当我们用普朗克2015年的数据，SZ集群计数和最近的高精度局部测量$\mathrm{H}_0$来约束PPS时，我们看到了令人惊讶的强有力的证据。相反，将普朗克与物质功率谱和BAO测量相结合，会产生更弱的约束。考虑到这一结果对数据的选择很敏感，SZ星系团计数、普朗克和$\mathrm{H}_0$测量之间的这种紧张关系很可能表明了模拟PPS特征的未建模系统偏差，而不是PPS或中微子领域的新物理。

英文摘要：

We test the sensitivity of neutrino parameter constraints from combinations of CMB and LSS data sets to the assumed form of the primordial power spectrum (PPS) using Bayesian model selection. Significantly, none of the tested combinations, including recent high-precision local measurements of $\mathrm{H}_0$ and cluster abundances, indicate a signal for massive neutrinos or extra relativistic degrees of freedom. For PPS models with a large, but fixed number of degrees of freedom, neutrino parameter constraints do not change significantly if the location of any features in the PPS are allowed to vary, although neutrino constraints are more sensitive to PPS features if they are known a priori to exist at fixed intervals in $\log k$. Although there is no support for a non-standard neutrino sector from constraints on both neutrino mass and relativistic energy density, we see surprisingly strong evidence for features in the PPS when it is constrained with data from Planck 2015, SZ cluster counts, and recent high-precision local measurements of $\mathrm{H}_0$. Conversely combining Planck with matter power spectrum and BAO measurements yields a much weaker constraint. Given that this result is sensitive to the choice of data this tension between SZ cluster counts, Planck and $\mathrm{H}_0$ measurements is likely an indication of unmodeled systematic bias that mimics PPS features, rather than new physics in the PPS or neutrino sector.

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