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arXiv 1206.3076astro-ph.COhep-ph
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来自衰变暗物质的冷正电子

Cold Positrons from Decaying Dark Matter

Lotfi Boubekeur, Scott Dodelson, Oscar Vives

摘要:

许多暗物质的模型都包含不止一种新粒子,而这些粒子都是标准模型中的粒子。随着宇宙的演化,较重的粒子常常会衰变成最轻的暗物质粒子。在这里,我们探讨了如果(重粒子)$\rightarrow$(暗物质)衰变的产物之一是正电子,并且其寿命比宇宙的年龄短的可能性。正电子通过散射宇宙微波背景而冷却下来,并最终在落入银河势阱时湮灭。由此产生的511千电子伏通量不仅对这类模型提出了限制,而且甚至可能与INTEGRAL卫星观测到的通量一致。

英文摘要:

Many models of dark matter contain more than one new particle beyond those in the Standard Model. Often heavier particles decay into the lightest dark matter particle as the Universe evolves. Here we explore the possibilities that arise if one of the products in a (Heavy Particle) $\rightarrow$ (Dark Matter) decay is a positron, and the lifetime is shorter than the age of the Universe. The positrons cool down by scattering off the cosmic microwave background and eventually annihilate when they fall into Galactic potential wells. The resulting 511 keV flux not only places constraints on this class of models but might even be consistent with that observed by the INTEGRAL satellite.

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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