Relaxion window
Relaxion window
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DOI：
10.1142/s0217732317501425
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发表时间：
2017
影响因子：
1.4
通讯作者：
下村崇
中科院分区：
文献类型：
--
作者：
浦川優子;小林達夫;瀬戸治;下村崇
我们研究了 Graham、Kaplan 和 Rajendran 提出的原始松弛情景的宇宙学约束。我们首先讨论当 QCD 轴子是原始论文中提出的弛豫-暴胀耦合的弛豫时，标量势项的适当符号选择。接下来，我们推导出 QCD 弛豫和非 QCD 弛豫的宇宙学一致质量范围和弛豫耦合。质量范围通过以下方式获得。我们还发现，弛豫稳定时的哈勃参数与非QCD强动力学尺度之间存在很强的相关性，从而产生非微扰弛豫余弦势。对于更高的松弛质量，可以使用大尺度。然而，由于其质量较低，应该很小，构建这样的粒子物理模型具有挑战性。
We investigate cosmological constraints on the original relaxion scenario proposed by Graham, Kaplan and Rajendran. We first discuss the appropriate sign choice of the terms in the scalar potential, when the QCD axion is the relaxion with a relaxion–inflaton coupling proposed in the original paper. We next derive the cosmologically consistent ranges of the mass and a coupling of the relaxion for both the QCD relaxion and non-QCD relaxion. The mass range is obtained by. We also find that a strong correlation between the Hubble parameter at the relaxion stabilization and the scaleof non-QCD strong dynamics, which generates the non-perturbative relaxion cosine potential. For a higher relaxion mass, a large scalebecomes available. However, for its lower mass,should be small and constructing such a particle physics model is challenging.