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arXiv 1809.04849hep-phastro-ph.CO
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衰变暗物质的五步冻结生产

Freeze-in production of decaying dark matter in five steps

Saniya Heeba, Felix Kahlhoefer, Patrick Stöcker

摘要:

我们研究了在keV到MeV范围内与标准模型希格斯玻色子玻色子有微小混合的标量玻色子的宇宙学演化和唯象性质。混合决定了通过冻结机制产生的轻标量的丰度和它们的寿命。有趣的是,这些标量所需的参数来解释目前宇宙中所有的暗物质,一般预测寿命与现在和未来的间接探测实验的灵敏度相当。为了准确地确定光标量的遗迹丰度,我们计算冻结产量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玻尔兹曼方程的数量变化过程中的黑暗部门。我们发现,光标量可以潜在地解释在3.5千电子伏的异常X射线发射,同时逃避约束的结构形成和预测潜在的可观察到的自相互作用截面。

英文摘要:

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.

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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