Constraining sterile neutrino dark matter with phase space density observations
Constraining sterile neutrino dark matter with phase space density observations
复制标题
通过相空间密度观测约束惰性中微子暗物质
DOI：
10.1088/1475-7516/2008/10/041
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发表时间：
2008
影响因子：
6.4
通讯作者：
V. Rubakov
中科院分区：
文献类型：
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作者：
D. Gorbunov;A. Khmelnitsky;V. Rubakov
我们应用相空间密度的考虑，以获得作为暗物质候选者的不育中微子的质量的下限。对于非共振产生、轻子不对称性存在下的共振产生和较重粒子衰变中的产生，边界是不同的。在前一种情况下，我们的束缚与莱曼-α束缚相当，但与之无关，并且与x射线上限一起，它不利于非共振产生的无菌中微子暗物质。后一种情况的一个有趣的特征是，温暖的暗物质可能由重粒子组成。
We apply phase space density considerations to obtain lower bounds on the mass of the sterile neutrino as a dark matter candidate. The bounds are different for non-resonant production, resonant production in the presence of lepton asymmetry and production in decays of heavier particles. In the former case our bound is comparable to but independent of the Lyman-α bound, and together with the x-ray upper limit it disfavors non-resonantly produced sterile neutrino dark matter. An interesting feature of the latter case is that warm dark matter may be composed of heavy particles.