Neutralino dark matter in brane world cosmology
Neutralino dark matter in brane world cosmology
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DOI：
10.1103/physrevd.71.063535
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发表时间：
2004-09
影响因子：
5
通讯作者：
Takeshi Nihei;N. Okada;O. Seto
中科院分区：
文献类型：
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作者：
Takeshi Nihei;N. Okada;O. Seto
研究了膜世界宇宙学中中性伴子暗物质的热遗迹密度。由于膜世界宇宙学中高能区域的膨胀定律与标准宇宙学中的膨胀定律不同，因此最终的遗迹密度可以改变。结果表明，当五维普朗克质量M{sub 5}小于10{sup 4} TeV时，在退耦时刻膜世界宇宙学效应显著，由此产生的残余密度增大.我们计算了约束最小超对称标准模型中的中性伴子遗迹密度，并表明随着M{sub 5}的减小，允许区域与标准宇宙学中的区域相比发生了显著的变化，并最终消失.我们还发现了一个新的下界M{sub 5} >或近似。600 TeV，基于中性伴子暗物质假设，即允许中性伴子暗物质存在的下限。
The thermal relic density of neutralino dark matter in the brane world cosmology is studied. Since the expansion law at a high energy regime in the brane world cosmology is modified from the one in the standard cosmology, the resultant relic density can be altered. It has been found that, if the five-dimensional Planck mass M{sub 5} is lower than 10{sup 4} TeV, the brane world cosmological effect is significant at the decoupling time, and the resultant relic density is enhanced. We calculate the neutralino relic density in the constrained minimal supersymmetric standard model and show that the allowed region is dramatically modified from the one in the standard cosmology and eventually disappears as M{sub 5} is decreasing. We also find a new lower bound on M{sub 5} > or approx. 600 TeV based on the neutralino dark matter hypothesis, namely, the lower bound in order for the allowed region of neutralino dark matter to exist.