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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1004.0695astro-ph.COhep-ph
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WMAP-7后的中微子和轴子热暗物质边界

Neutrino and axion hot dark matter bounds after WMAP-7

Steen Hannestad, Alessandro Mirizzi, Georg G. Raffelt, Yvonne Y. Y. Wong

摘要:

我们更新宇宙学热暗物质对中微子和强子轴子的约束。我们最严格的限制使用7年的数据从威尔金森微波各向异性探测器的宇宙微波背景各向异性,晕功率谱(HPS)从第7次数据发布的斯隆数字巡天,和哈勃常数从哈勃太空望远镜观测。我们发现95%的C.L. \sum m_v <0.44 eV(无轴子),m_a <0.91 eV(假设\sum m_v = 0),以及在边缘化相应的其他质量之后,对于两个热暗物质组分,\sum m_v <0.41 eV且m_a <0.72 eV的上限。仅CMB数据得出\sum m_v <1.19 eV(无轴子),而对于轴子,HPS对于导出m_a约束至关重要。这种差异可以追溯到这样一个事实,即对于给定的热暗物质分数,轴子的质量要比中微子大得多。

英文摘要:

We update cosmological hot dark matter constraints on neutrinos and hadronic axions. Our most restrictive limits use 7-year data from the Wilkinson Microwave Anisotropy Probe for the cosmic microwave background anisotropies, the halo power spectrum (HPS) from the 7th data release of the Sloan Digital Sky Survey, and the Hubble constant from Hubble Space Telescope observations. We find 95% C.L. upper limits of \sum m_ν<0.44 eV (no axions), m_a<0.91 eV (assuming \sum m_ν=0), and \sum m_ν<0.41 eV and m_a<0.72 eV for two hot dark matter components after marginalising over the respective other mass. CMB data alone yield \sum m_ν<1.19 eV (no axions), while for axions the HPS is crucial for deriving m_a constraints. This difference can be traced to the fact that for a given hot dark matter fraction axions are much more massive than neutrinos.

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