Axino mass in supergravity models
Axino mass in supergravity models
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DOI：
10.1016/0370-2693(95)00881-k
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发表时间：
1995-03
影响因子：
4.4
通讯作者：
E. Chun;A. Lukas
中科院分区：
文献类型：
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作者：
E. Chun;A. Lukas
我们分析的质量的轴子，费米子的超伙伴的轴子，在一般的超引力模型，将Peccei-Quinn对称性，并确定宇宙学约束这个质量。特别是，我们推导出一个简单的标准来识别模型的LSP axino具有质量为O（m3 22 PQ）= O（千电子伏），可以作为（温暖）暗物质的候选人。我们指出，这样的模型具有非常特殊的属性，此外，小axino质量必须保护免受辐射修正，要求在Peccei-Quinn部门的小耦合。一般来说，我们发现一个axino质量的顺序m3 2。这样的质量是由一个axino衰变的要求，发生在普通LSP的去耦的约束。特别是，对于大的Peccei-Quinn尺度fPQ> 1011 GeV，这个约束可能难以满足。
We analyze the mass of the axino, the fermionic superpartner of the axion, in general supergravity models incorporating a Peccei-Quinn symmetry and determine the cosmological constraints on this mass. In particular, we derive a simple criterion to identify models with an LSP axino which has a mass of O( m3 22ƒPQ) = O ( keV ) and can serve as a candidate for (warm) dark matter. We point out that such models have very special properties and in addition, the small axino mass has to be protected against radiative corrections by demanding small couplings in the Peccei-Quinn sector. Generically, we find an axino mass of order m3 2. Such masses are constrained by the requirement of an axino decay which occurs before the decoupling of the ordinary LSP. Especially, for a large Peccei-Quinn scale fPQ> 1011GeV this constraint might be difficult to fulfill.