arXiv 0903.43772009-03astro-ph.COhep-ph

暗物质轴子再探

Dark Matter Axions Revisited

Luca Visinelli, Paolo Gondolo

备注：: 14 pages, 3 figures
发表信息：: Phys. Rev. D 80, 035024 (2009)
DOI：: 10.1103/PhysRevD.80.035024

摘要：

我们研究的理论参数的具体值的轴子可以形成整体的冷暗物质。我们检查允许的轴子参数区域的光最近收集的数据由WMAP 5任务加上重子声学振荡和超新星，并假设一个暴胀的情况和标准宇宙学。如果在暴胀之后恢复佩切-奎因对称性，我们就恢复了轴子质量和密度之间的通常关系，因此轴子质量$m_a =67\pm2{\rm μeV}$使轴子成为100%的冷暗物质。如果Peccei-Quinn对称性在暴胀过程中被破坏，那么轴子可以是$m_a < 15{\rm meV}$的冷暗物质的100%，只要初始失准角$θ_i$的特定值被选择为与其质量$m_a$的给定值相对应。大的Peccei-Quinn对称性破缺标度值对应于小的，可能是令人不舒服的小的初始失准角$θ_i$值。

英文摘要：

We study for what specific values of the theoretical parameters the axion can form the totality of cold dark matter. We examine the allowed axion parameter region in the light of recent data collected by the WMAP5 mission plus baryon acoustic oscillations and supernovae, and assume an inflationary scenario and standard cosmology. If the Peccei-Quinn symmetry is restored after inflation, we recover the usual relation between axion mass and density, so that an axion mass $m_a =67\pm2{\rm μeV}$ makes the axion 100% of the cold dark matter. If the Peccei-Quinn symmetry is broken during inflation, the axion can instead be 100% of the cold dark matter for $m_a < 15{\rm meV}$ provided a specific value of the initial misalignment angle $θ_i$ is chosen in correspondence to a given value of its mass $m_a$. Large values of the Peccei-Quinn symmetry breaking scale correspond to small, perhaps uncomfortably small, values of the initial misalignment angle $θ_i$.

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英文摘要：

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