Early Annihilation and Diffuse Backgrounds in Models of Weakly Interacting Massive Particles in Which the Cross Section for Pair Annihilation Is Enhanced by 1/v
Early Annihilation and Diffuse Backgrounds in Models of Weakly Interacting Massive Particles in Which the Cross Section for Pair Annihilation Is Enhanced by 1/v
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DOI：
10.1103/physrevlett.101.261301
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发表时间：
2008-10
影响因子：
8.6
通讯作者：
M. Kamionkowski;S. Profumo
中科院分区：
文献类型：
--
作者：
M. Kamionkowski;S. Profumo
最近的研究考虑了对标准的弱相互作用大质量粒子方案的修改，在这种方案中，星系中的对湮灭截面（乘以相对速度v）被增强了1/v~10^-3，这足以解释几个令人困惑的银河系辐射信号。我们表明，在这些情况下，爆发的弱相互作用的大质量粒子湮灭发生在第一个崩溃的暗物质晕。我们表明，严格的约束湮没截面来自测量的弥漫河外辐射和电离和加热的星系际介质。
Recent studies have considered modifications to the standard weakly interacting massive particle scenario in which the pair annihilation cross section (times relative velocity v) is enhanced by a factor 1/v~10^-3 in the Galaxy, enough to explain several puzzling Galactic radiation signals. We show that in these scenarios a burst of weakly interacting massive particle annihilation occurs in the first collapsed dark-matter halos. We show that severe constraints to the annihilation cross section derive from measurements of the diffuse extragalactic radiation and from ionization and heating of the intergalactic medium.