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arXiv 0711.2600hep-ph
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普适额外维模型中中微子质量与允许参数区的变化

The neutrino masses and the change of allowed parameter region in universal extra dimension models

Shigeki Matsumoto, Joe Sato, Masato Senami, Masato Yamanaka

摘要:

在具有右手中微子的普适额外维模型框架下研究了暗物质的残余丰度。这些模型摆脱了原来的普适额外维模型所具有的严重的Kaluza-Klein(KK)引力子问题。右手中微子的第一个KK粒子是该框架中暗物质的候选者。当普通中微子质量足够大时,例如简并质谱的情况,暗物质遗迹丰度会发生显着变化。与宇宙学观测一致的额外维度的尺度可以是500 GeV,在具有右手中微子的宇宙额外维度模型的最小设置中。

英文摘要:

Relic abundance of dark matter is investigated in the framework of universal extra dimension models with right-handed neutrinos. These models are free from the serious Kaluza-Klein (KK) graviton problem that the original universal extra dimension model possesses. The first KK particle of the right-handed neutrino is a candidate for dark matter in this framework. When ordinary neutrino masses are large enough such as the degenerate mass spectrum case, the dark matter relic abundance can change significantly. The scale of the extra dimension consistent with cosmological observations can be 500 GeV in the minimal setup of universal extra dimension models with right-handed neutrinos.

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