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arXiv 1402.4500hep-phastro-ph.HE
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非对称暗物质的湮灭信号

Annihilation Signals from Asymmetric Dark Matter

Edward Hardy, Robert Lasenby, James Unwin

摘要:

在最简单的非对称暗物质模型中,由于暗物质是非自共轭的,反暗物质的残余密度可以忽略不计,因此不可能产生湮灭信号。我们调查一类新的模型中,对称DM组件,在“低质量”1-10 GeV的制度有利于连接DM和重子不对称性,通过衰变重新填充。我们发现,在模型中没有显着的速度依赖的湮灭截面,观测约束一般迫使这些衰变(宇宙学)慢。这些晚期衰变可以产生不同于通常的湮灭轮廓的伽马射线信号形态。这种模型的一个显著特点是矮球状星系可能没有信号。

英文摘要:

In the simplest models of asymmetric dark matter (ADM) annihilation signals are not expected, since the DM is non-self-conjugate and the relic density of anti-DM is negligible. We investigate a new class of models in which a symmetric DM component, in the `low-mass' 1-10 GeV regime favoured for linking the DM and baryon asymmetries, is repopulated through decays. We find that, in models without significant velocity dependence of the annihilation cross section, observational constraints generally force these decays to be (cosmologically) slow. These late decays can give rise to gamma-ray signal morphologies differing from usual annihilation profiles. A distinctive feature of such models is that signals may be absent from dwarf spheroidal galaxies.

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