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arXiv 1408.5142hep-phastro-ph.CO
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湮灭非对称暗物质

Annihilating Asymmetric Dark Matter

Nicole F. Bell, Shunsaku Horiuchi, Ian M. Shoemaker

摘要:

在热不对称暗物质(ADM)模型中,粒子和反粒子暗物质(DM)的残余丰度不需要有很大的不同。通过考虑原始不对称性对耦合DM和反DM的热玻尔兹曼演化的影响,我们导出了所需的湮灭截面。这与CMB和Fermi-LAT伽马射线数据结合使用,以限制在热冻结中存活的反DM粒子的数量密度。在热ADM框架下重新分析银河系中心的扩展γ射线辐射时,我们发现湮没成$τ$轻子的反DM数密度比DM的更倾向于1-4 $\%$,而$b$ -夸克通道的反DM数密度比DM的更倾向于50-100 $\%$。

英文摘要:

The relic abundance of particle and antiparticle dark matter (DM) need not be vastly different in thermal asymmetric dark matter (ADM) models. By considering the effect of a primordial asymmetry on the thermal Boltzmann evolution of coupled DM and anti-DM, we derive the requisite annihilation cross section. This is used in conjunction with CMB and Fermi-LAT gamma-ray data to impose a limit on the number density of anti-DM particles surviving thermal freeze-out. When the extended gamma-ray emission from the Galactic Center is reanalyzed in a thermal ADM framework, we find that annihilation into $τ$ leptons prefer anti-DM number densities 1-4$\%$ that of DM while the $b$-quark channel prefers 50-100$\%$.

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