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arXiv 1205.0551hep-phastro-ph.CO
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来自keVins的暖暗物质

Warm Dark Matter from keVins

Stephen F. King, Alexander Merle

摘要:

我们提出了一个简单的暖暗物质(WDM)模型,其中两个费米子被添加到标准模型:(准)稳定“keVins”(keV惰性费米子),占WDM和他们的不稳定的兄弟,“GeVins”(GeV惰性费米子),两者都携带零电荷和轻子数,(近似)“惰性”,在这个意义上,它们唯一的相互作用是通过抑制耦合到Z。我们认为,在这种情况下,稳定的keVins热产生的,其丰度随后被稀释的熵产生较重的不稳定GeVins的衰变。这种机制可以在各种各样的模型中实现,包括E_6激发的超对称模型或包含无菌中微子的模型。

英文摘要:

We propose a simple model for Warm Dark Matter (WDM) in which two fermions are added to the Standard Model: (quasi-) stable "keVins" (keV inert fermions) which account for WDM and their unstable brothers, the "GeVins" (GeV inert fermions), both of which carry zero electric charge and lepton number, and are (approximately) "inert", in the sense that their only interactions are via suppressed couplings to the Z. We consider scenarios in which stable keVins are thermally produced and their abundance is subsequently diluted by entropy production from the decays of the heavier unstable GeVins. This mechanism could be implemented in a wide variety of models, including E_6 inspired supersymmetric models or models involving sterile neutrinos.

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