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arXiv 1809.06003hep-phastro-ph.CO
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二重子不可能是暗物质

Dibaryons cannot be the dark matter

Edward W. Kolb, Michael S. Turner

摘要:

假设的$SU(3)$味单重子态$S$与奇异$-2$已经被讨论作为一个暗物质候选者,能够解释奇怪的5比1的暗物质的质量密度比的重子。我们研究了早期宇宙中产生的双重子,发现不管QCD夸克/强子跃迁产生的强子丰度如何,快速的粒子反应使$S$丰度热化,它跟踪平衡,直到它在一个很小的值“冻结”。对于合理的重子质量范围(1860 - 1890 MeV)和关于其相互作用截面的慷慨假设,PDMATHAMN最多只能解释重子数的$10^{-11}$,因此不可能是暗物质。虽然它不是暗物质,但如果$S$存在,它可能是一个有趣的遗迹。

英文摘要:

The hypothetical $SU(3)$ flavor-singlet dibaryon state $S$ with strangeness $-2$ has been discussed as a dark-matter candidate capable of explaining the curious 5-to-1 ratio of the mass density of dark matter to that of baryons. We study the early-universe production of dibaryons and find that irrespective of the hadron abundances produced by the QCD quark/hadron transition, rapid particle reactions thermalized the $S$ abundance, and it tracked equilibrium until it "froze out" at a tiny value. For the plausible range of dibaryon masses (1860 - 1890 MeV) and generous assumptions about its interaction cross sections, $S$'s account for at most $10^{-11}$ of the baryon number, and thus cannot be the dark matter. Although it is not the dark matter, if the $S$ exists it might be an interesting relic.

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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