来自失准希格斯场微扰衰变的暗光子
Dark Photons from Perturbative Decay of a Misaligned Higgs Field
AI总结：
本研究重新探讨暴胀期间失准暗希格斯场微扰衰变产生暗光子暗物质的机制，给出自洽参数范围，指出可通过未来CMB、莱曼α观测及直接探测等实验检验该参数空间。
AI中文摘要：
我们重新研究了作为暗物质的暗光子$A'$的产生机制，其源于暗希格斯场$h$的微扰衰变——该场在暴胀期间随机偏离其势能极小值。这是一个用于生成$A'$遗迹丰度的简单且具有预测性的框架。该机制受到结构形成的约束，因为$A'$初始时具有较大动能，同时还受暴胀等曲率涨落的约束，这要求四次耦合$\boldsymbol{\u03bb h^4}$较小。我们确定了在该场景下自洽的$A'$质量范围为100 eV至1 GeV，规范耦合$g\boldsymbol{\u223c 10^{-15}-10^{-10}}$；若存在一般水平的动能混合，这些参数将受到更严格的约束。该有利参数区域可通过未来的CMB（宇宙微波背景）或Lyman-$\boldsymbol{\u03b1}$（莱曼α）观测进行检验，若存在动能混合，还可通过直接探测实验或弥散软伽马射线搜寻来验证。
英文摘要：
We reconsider the production of dark photons $A'$ as dark matter, from the perturbative decay of a dark Higgs field $h$, that is stochastically misaligned from the minimum of its potential during inflation. This is a simple and predictive framework for generating the $A'$ relic abundance. It is constrained by structure formation, since the $A'$ are initially boosted, and inflationary isocurvature fluctuations, which require small quartic couplings $λh^4$. We identify $A'$ masses between 100 eV and 1 GeV and gauge couplings $g\sim 10^{-15}-10^{-10}$ that are consistent in this scenario, and which become more tightly constrained if a generic level of kinetic mixing is present. The favored parameter region could be tested through future CMB or Lyman-$α$ observations, and, in the presence of kinetic mixing, by direct detection experiments or diffuse soft gamma-ray searches.
