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arXiv 2408.08355hep-phastro-ph.CO
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来自动力学失配的轴子暗物质的模型实现

Model implementations of axion dark matter from kinetic misalignment

Cem Eröncel, Ryosuke Sato, Géraldine Servant, Philip Sørensen

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51 pages, 21 figures (main text without references) + 47 pages, 25 figures (appendices)
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AI总结：

本研究探索轴子动力学失配机制的紫外完备模型，分析热阻尼与希格斯门户两种阻尼机制，提出可被现有实验探测的轴子暗物质模型，并指出其与特定暴胀形式的关联。

摘要：

轴子动力学失配机制（kinetic misalignment mechanism, KMM）为解释几乎任何轴子质量和衰变常数下的暗物质提供了可能性，这些参数区间是标准失配机制无法覆盖的，尤其是在轴子衰变常数取值较低（即耦合较强）的情况下。这对大多数能够探测暗物质、探索轴子宇宙学新区域的轴子实验而言是新的机遇。我们仔细研究了能够导出KMM机制的紫外完备理论。这些理论主要依赖于轴子伙伴——复标量场的径向模——的早期动力学，轴子正是从该径向模继承了动能。而径向模能量密度的阻尼是实现该机制的必要组成部分。我们详细研究了来自等离子体中相互作用的热阻尼效应。一种最简且相当自然的实现方案是KSVZ型模型，该模型的径向模具有近二次势，并由破坏U(1)对称性的高维算符扩展得到。此外，我们研究了希格斯门户相互作用作为另一种阻尼机制，并对先前提出的基于四次势的实现方案进行了改进。这些实现方案可以让QCD轴子成为暗物质且处于IAXO的探测范围内，而MADMAX、IAXO和ALPS II则能够探测作为暗物质的一般性类轴子粒子（Axion-Like-Particle, ALP）。这类模型通常具有一个kinatio（动能主导）时期。我们还表明，来自KMM的ALP暗物质指向了一种特定的暴胀实现形式。

英文摘要：

The axion kinetic misalignment mechanism (KMM) opens the possibility of explaining dark matter for almost any axion mass and decay constant that are not accessible by the standard misalignment mechanism, in particular at low values of the axion decay constant (i.e. large coupling). This is a new opportunity for most axion experiments which could be sensitive to dark matter and probe new regimes of axion cosmology. We scrutinise UV completions that lead to the KMM mechanism. These mainly rely on the early dynamics of the axion partner, the radial mode of the complex scalar field, from which the axion inherits kinetic energy. The damping of the radial-mode energy density is then a necessary ingredient. We study in detail thermal damping from interactions in the plasma. A minimal and rather natural implementation consists of a KSVZ-type model with a nearly-quadratic potential for the radial mode extended by U(1)-breaking higher-dimensional operators. Furthermore, we study Higgs portal interactions as an alternative damping mechanism and improve upon previously proposed implementations based on quartic potentials. These implementations can lead to the QCD axion being dark matter and in the reach of IAXO, while MADMAX, IAXO and ALPS II can be sensitive to a generic Axion-Like-Particle (ALP) as dark matter. Such models typically feature a kination era. We also show that ALP dark matter from KMM points to a particular realization of inflation.

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。

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