用S1和S2探测弛豫和Higgs门
Probing the relaxed relaxion and Higgs-portal with S1 & S2
摘要：
我们研究了最近的\XeT过剩的背景下，太阳标量，特别是在希格斯门和弛豫模型的框架。我们表明，$m_ϕ= 1.9\,\keV$和$g_{ϕe}=2.4\times 10^{-14}$可以解释在1-7 keV范围内的科学运行1（SR 1）分析中观察到的过剩。当转换成标量-希格斯混合角时，由于标量质量的技术自然性，相应的混合角$\sinθ= 10^{-8}$非常接近混合角的最大值。与太阳轴子模型不同的是，由于其光谱较软，过剩有利于大质量标量场。在最小的情况下，我们认为，最适合的参数与恒星冷却边界的紧张局势。我们讨论了一种可能性，一个大密度的红巨星可能会触发一个相变，导致局部标量质量增加抑制恒星冷却。对于最小弛豫的情况下，我们发现，这种类型的变色龙效应是自动存在的，但他们不能缓解冷却边界。然而，它们有能力在整个宇宙中引发灾难性的相变。根据这一观察，我们得到一组新的边界上的松弛松弛参数空间。
英文摘要：
We study the recent \XeT excess in context of solar scalar, specifically in the framework of Higgs-portal and the relaxion model. We show that $m_ϕ= 1.9\,\keV$ and $g_{ϕe}=2.4\times 10^{-14}$ can explain the observed excess in science run 1 (SR1) analysis in the 1-7 keV range. When translated into the scalar-Higgs mixing angle, the corresponding mixing angle $\sinθ= 10^{-8}$ is intriguingly close to the maximum value of mixing angle for the technical naturalness of the scalar mass. Unlike the solar axion model, the excess favors a massive scalar field because of its softer spectrum. In the minimal scenarios we consider, the best fit parameters are in tension with stellar cooling bounds. We discuss a possibility that a large density of red giant stars may trigger a phase transition, resulting in a local scalar mass increase suppressing the stellar cooling. For the particular case of minimal relaxion scenarios, we find that such type of chameleon effects is automatically present but they can not ease the cooling bounds. They are however capable of triggering a catastrophic phase transition in the entire universe. Following this observation we derive a new set of bounds on the relaxed-relaxion parameter space.
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