Thermally generated gauge singlet scalars as self-interacting dark matter.
Thermally generated gauge singlet scalars as self-interacting dark matter.
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DOI：
10.1103/physrevlett.88.091304
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发表时间：
2001-06
影响因子：
8.6
通讯作者：
J. McDonald
中科院分区：
文献类型：
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作者：
J. McDonald
我们证明了一个规范单重态标量S，与希格斯二重态的耦合形式为lambda（S）S+SH+H，并且S的质量完全由希格斯期望值产生，如果m（S）约等于（2.9-10.5）（Omega（S）/0.3）（1/5）（h/0.7）（2/5）MeV，则S的热生残余密度Omega（S）约等于0.3。值得注意的是，这非常类似于当η比1小得多时，自相互作用（η/4）（S+S）（2）解释自相互作用暗物质所需的范围[m（S）=（6.6-15.4）eta（2/3）MeV]。相应的耦合是λ（S）近似（2.7 x 10（-10）-3.6 x 10（-9））（Omega（S）/0.3）（2/5）（h/0.7）（4/5），这意味着这些标量与标准模型扇区的耦合非常弱。
We show that a gauge singlet scalar S, with a coupling to the Higgs doublet of the form lambda(S)S+SH+H and with the S mass entirely generated by the Higgs expectation value, has a thermally generated relic density Omega(S)approximately equal to 0.3 if m(S)approximately equal to (2.9-10.5) (Omega(S)/0.3)(1/5)(h/0.7)(2/5) MeV. Remarkably, this is very similar to the range [m(S) = (6.6-15.4)eta(2/3) MeV] required in order for the self-interaction (eta/4) (S+S)(2) to account for self-interacting dark matter when eta is not much smaller than 1. The corresponding coupling is lambda(S)approximate(2.7 x 10(-10)-3.6 x 10(-9)) (Omega(S)/0.3)(2/5)(h/0.7)(4/5), implying that such scalars are very weakly coupled to the standard model sector.