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arXiv 0808.0490hep-ph
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F_D项混合暴胀模型中的热右手中微子暗物质

Thermal Right-Handed Sneutrino Dark Matter in the F_D-Term Model of Hybrid Inflation

Frank Deppisch, Apostolos Pilaftsis

摘要:

本文计算了混合暴胀超对称F_D项模型中右手中微子的剩余丰度。F_D项模型不仅为μ和引力子过剩问题提供了一个自然的解决方案,而且为宇宙中冷的暗物质提供了一个新的可行的候选者:最轻的右手超中微子。特别地,F_D项模型预言了纯右手中微子与Higgs二重态的一种新的四次耦合,这种耦合使中微子热化,并使它们湮灭得足够快,达到与当前宇宙微波背景数据相一致的水平.我们详细分析了这种情况下,并确定有利的区域的参数空间的最小超引力的框架内,最轻的右手sneutrino成为热暗物质,与WMAP观测宇宙膨胀。来自直接暗物质搜索实验的约束。

英文摘要:

We compute the relic abundance of the right-handed sneutrinos in the supersymmetric F_D-term model of hybrid inflation. As well as providing a natural solution to the mu- and gravitino overabundance problems, the F_D-term model offers a new viable candidate to account for the cold dark matter in the Universe: the lightest right-handed sneutrino. In particular, the F_D-term model predicts a new quartic coupling of purely right-handed sneutrinos to the Higgs doublets that thermalizes the sneutrinos and makes them annihilate sufficiently fast to a level compatible with the current cosmic microwave background data. We analyze this scenario in detail and identify favourable regions of the parameter space within the framework of minimal supergravity, for which the lightest right-handed sneutrino becomes the thermal dark matter, in agreement with WMAP observations of cosmological inflation. Constraints derived from direct dark matter searches experiments are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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