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arXiv 2012.09865hep-phastro-ph.COastro-ph.HEhep-ex
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暗重子的宇宙学和天体物理学探测

Cosmological and astrophysical probes of dark baryons

David McKeen, Maxim Pospelov, Nirmal Raj

摘要:

我们研究了“暗重子”的宇宙学和天体物理学特征,这是一种与中子混合的中性费米子。由于混合是通过夸克水平上的高维算子进行的,因此高能暗重子的产生得到了增强,因此它在早期宇宙中的丰度可能是显着的。把它的初始丰度作为一个自由参数,我们得到新的,强大的限制的性质的黑暗重子。原始核合成和宇宙微波背景提供了强的约束,由于中子通过其诱导跃迁偶极相互转换为暗重子,并由于暗重子的后期衰变。此外,中子星中的中子可以缓慢地衰变为暗重子,提供了一种新的热源,但受到脉冲星温度测量的限制。考虑到所有的约束条件,我们确定参数空间的黑暗重子可以是一个可行的暗物质的候选人,并讨论有前途的途径探测它。

英文摘要:

We examine the cosmological and astrophysical signatures of a "dark baryon," a neutral fermion that mixes with the neutron. As the mixing is through a higher-dimensional operator at the quark level, production of the dark baryon at high energies is enhanced so that its abundance in the early universe may be significant. Treating its initial abundance as a free parameter, we derive new, powerful limits on the properties of the dark baryon. Primordial nucleosynthesis and the cosmic microwave background provide strong constraints due to the inter-conversion of neutrons to dark baryons through their induced transition dipole, and due to late decays of the dark baryon. Additionally, neutrons in a neutron star could decay slowly to dark baryons, providing a novel source of heat that is constrained by measurements of pulsar temperatures. Taking all the constraints into account, we identify parameter space where the dark baryon can be a viable dark matter candidate and discuss promising avenues for probing it.

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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