标题： 超重暗物质在跷跷板框架内 显示英文标题

标题： Superheavy dark matter within the seesaw framework

摘要： 超重的右旋中微子已知可以提供一种经济的解决方案，以产生轻中微子的质量以及通过它们在早期宇宙中的衰变产生的轻子不对称性，随后这种不对称性转化为重子不对称性。 标准模型的另一个缺失部分是暗物质，如果粒子寿命异常长，即大于$\simeq 10^{22}~$年，也可以是超重的。依赖于两种不同的跷跷板框架，并假设右旋中微子区有轻微混合，我们表明，质量为$M_X$的马约拉纳质量本征态可以作为暗物质候选者，前提是质量混合参数$\delta M$大约满足$\delta M\lesssim 2\times 10^{-17}/[M_X/(10^9~\mathrm{GeV})]^{0.5}$~GeV 对于$M_X\gtrsim 10^9$~GeV。 讨论了在暴胀宇宙学背景下的某些影响。 显示英文摘要

摘要： Superheavy right-handed neutrinos are known to provide an economical solution to generate the mass of the light neutrinos as well as a lepton asymmetry through to their decay in the early Universe that gets subsequently converted into a baryon asymmetry. Another missing piece of the Standard Model is dark matter, which can also be superheavy provided that the particle lifetime is anomalously long, i.e. greater than $\simeq 10^{22}~$yr. Relying on two variants of the seesaw framework, and assuming slight mixing in the right-handed neutrino sector, we show that the resulting Majorana mass eigenstates with mass $M_X$ can be dark matter candidates provided that the mass mixing parameter $\delta M$ satisfies approximately $\delta M\lesssim 2\times 10^{-17}/[M_X/(10^9~\mathrm{GeV})]^{0.5}$~GeV for $M_X\gtrsim 10^9$~GeV. Some implications in the context of inflationary cosmologies are discussed.