衰变的Majoron暗物质和中微子质量
Decaying Majoron Dark Matter and Neutrino Masses
摘要：
我们回顾最近的建议Lattanzi和Valle的majoron作为一个合适的温暖的暗物质的候选人。大强子是与未规范轻子数的自发破缺有关的戈德斯通玻色子，这是产生中微子质量的机制之一。majoron可以通过量子引力效应获得质量，并且可能解释宇宙中观测到的暗物质成分。通过对宇宙微波背景数据的分析，我们给出了对majoron寿命、质量和丰度的限制。我们发现，在热产生的情况下，majoron质量的极限为0.12keV <mJ <0.17keV，并讨论了在非热产生的情况下如何修改这些极限。主要的寿命被限制为大于250 Gyrs。我们还将这一结果应用于给定的中微子质量产生的跷跷板模型，并发现这将轻子数破缺相变的能量尺度限制在10^6 GeV以上。因此，我们发现，majoron衰变的暗物质（DDM）的情况下，很好地适合在模型中中微子质量出现“一拉跷跷板”，并可能导致其他可能的宇宙学意义。
英文摘要：
We review the recent proposal by Lattanzi & Valle of the majoron as a suitable warm dark matter candidate. The majoron is the Goldstone boson associated to the spontaneous breaking of ungauged lepton number, one of the mechanisms proposed to give rise to neutrino masses. The majoron can acquire a mass through quantum gravity effects, and can possibly account for the observed dark matter component of the Universe. We present constraints on the majoron lifetime, mass and abundance obtained by the analysis of the cosmic microwave background data. We find that, in the case of thermal production, the limits for the majoron mass read 0.12 keV<m_J<0.17 keV, and discuss how these limits are modified in the non-thermal case. The majoron lifetime is constrained to be larger than 250 Gyrs. We also apply this results to a given seesaw model for the generation of neutrino masses, and find that this constraints the energy scale for the lepton number breaking phase transition to be above 10^6 GeV. We thus find that the majoron decaying dark matter (DDM) scenario fits nicely in models where neutrino masses arise "a la seesaw" and may lead to other possible cosmological implications.
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