arXiv 1111.52812011-11-22astro-ph.COhep-ph

冷暗物质和暴胀模型中的轴子

Axions in Cold Dark Matter and Inflation Models

Luca Visinelli

备注：: Ph.D. Thesis, The University of Utah, 2011. 149 pages, 7 chapters

摘要：

本论文的研究对象是不可见的轴子和更一般的类轴子粒子族。不可见的轴子是一种假设的基本粒子，也是冷暗物质的候选者。我提出了一个改进的计算的参数空间的冷暗物质轴子在标准宇宙学的约束，其中包括贡献的非谐性的轴子潜力和从衰变的轴子弦。在这种情况下，我更新了冷暗物质轴子的质量值，发现值$(67\pm17){\rm μeV}$，比以前的计算大约大了一个数量级。首次研究了非标准宇宙学场景对轴子冷暗物质参数空间的影响。特别是，我认为低温再加热和kination宇宙学的情况下，我表明，冷暗物质轴子的质量可以从标准的宇宙学场景中的值不同的数量级。最后，我考虑类轴子粒子的家庭，假设这些粒子作为暴胀子的背景下，温暖的通货膨胀。我发现，轴子能量尺度$f$，在标准的通货膨胀的情况下是普朗克质量的顺序，可以降低到更安全的大统一理论尺度$f \sim 10^{16}{\rm GeV}$。我还约束参数空间和引力波的数量从这个模型，使用威尔金森微波各向异性探测器7年的数据的结果。

英文摘要：

The subjects of this thesis are the invisible axion and the more general family of axion-like particles. The invisible axion is a hypothetical elementary particle and a cold dark matter candidate. I present an improved computation of the constraints on the parameter space of the cold dark matter axion in the standard cosmology, that includes the contributions from anharmonicities in the axion potential and from the decay of axionic strings. In this scenario, I update the value of the mass of the cold dark matter axion, finding the value $(67\pm17){\rm μeV}$, approximately one order of magnitude larger than previous computations. The effect of nonstandard cosmological scenarios on the parameter space of axion cold dark matter is studied for the first time. In particular, I consider the cases of low-temperature reheating and kination cosmologies, and I show that the mass of the cold dark matter axion can differ from the value in the standard cosmological scenario by orders of magnitude. Finally, I consider the family of axion-like particles, assuming that these particles serve as the inflaton in the context of warm inflation. I find that the axion energy scale $f$, which in the standard inflation scenario is of the order of the Planck mass, can be lowered to the much safer Grand Unification Theory scale $f \sim 10^{16}{\rm GeV}$. I also constrain the parameter space and the amount of gravitational waves from this model, using results from the Wilkinson Microwave Anisotropy Probe 7-year data.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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