Freeze-in production of decaying dark matter in five steps
Freeze-in production of decaying dark matter in five steps
复制标题
通过五个步骤冻结产生衰变暗物质
DOI：
10.1088/1475-7516/2018/11/048
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发表时间：
2018
影响因子：
6.4
通讯作者：
Patrick Stöcker
中科院分区：
文献类型：
--
作者：
S. Heeba;F. Kahlhoefer;Patrick Stöcker
我们研究了在keV到MeV范围内与标准模型希格斯玻色子有微小混合的标量玻色子的宇宙学演化和现象学性质。混合决定了通过冻结机制产生的光标量的丰度和它们的寿命。有趣的是，这些标量所需要的参数可以解释当前宇宙中所有的暗物质，这些参数通常可以预测寿命，与当前和未来间接探测实验的灵敏度相当。为了准确地确定光标量的残余丰度，我们计算了冻结产率，包括有限温度和量子统计的影响，并开发了一种新的方法来解决黑暗部门数字变化过程的玻尔兹曼方程。我们发现光标量可以潜在地解释3.5 keV的异常x射线发射，同时逃避结构形成的限制并预测潜在的可观察到的自相互作用截面。
We study the cosmological evolution and phenomenological properties of scalar bosons in the keV to MeV range that have a tiny mixing with the Standard Model Higgs boson. The mixing determines both the abundance of light scalars produced via the freeze-in mechanism and their lifetime. Intriguingly, the parameters required for such scalars to account for all of the dark matter in the present Universe generically predict lifetimes comparable to the sensitivity of present and future indirect detection experiments. In order to accurately determine the relic abundance of light scalars, we calculate freeze-in yields including effects from finite temperatures and quantum statistics and develop a new approach for solving the Boltzmann equation for number-changing processes in the dark sector. We find that light scalars can potentially explain the anomalous x-ray emission at 3.5 keV, while evading constraints from structure formation and predicting potentially observable self-interaction cross sections.