一个改进的热轴子质量的宇宙学界限
An improved cosmological bound on the thermal axion mass
摘要：
遗迹热轴子可能在宇宙结构形成理论中扮演额外热暗物质成分的角色。通过结合最近的观测数据，我们改进了以前的宇宙学界限的轴子质量在所谓的强子轴子窗口。在95%c.l.，我们得到了轴子质量m_a < 0.42eV的极限。在99%c.l.时，m_a < 0.72eV。这里提出的分析的一个新的方面是包含大量的中微子，以及它们如何影响轴子质量的约束。例如，如果中微子质量属于一个倒层次方案，则上述约束在95%c. l.处改进为m_a < 0.38eV。在99%c.l.时，m_a < 0.67eV。来自CAST实验的未来数据将提供对宇宙学界限的直接检验。
英文摘要：
Relic thermal axions could play the role of an extra hot dark matter component in cosmological structure formation theories. By combining the most recent observational data we improve previous cosmological bounds on the axion mass m_a in the so-called hadronic axion window. We obtain a limit on the axion mass m_a < 0.42eV at the 95% c.l. (m_a < 0.72eV at the 99% c.l.). A novel aspect of the analysis presented here is the inclusion of massive neutrinos and how they may affect the bound on the axion mass. If neutrino masses belong to an inverted hierarchy scheme, for example, the above constraint is improved to m_a < 0.38eV at the 95% c.l. (m_a < 0.67eV at the 99% c.l.). Future data from experiments as CAST will provide a direct test of the cosmological bound.
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